diff --git a/common_audio/fir_filter_factory.cc b/common_audio/fir_filter_factory.cc
index bfa198f32f..4bcf05245f 100644
--- a/common_audio/fir_filter_factory.cc
+++ b/common_audio/fir_filter_factory.cc
@@ -36,10 +36,10 @@ FIRFilter* CreateFirFilter(const float* coefficients,
 // If we know the minimum architecture at compile time, avoid CPU detection.
 #if defined(WEBRTC_ARCH_X86_FAMILY)
   // x86 CPU detection required.
-  if (WebRtc_GetCPUInfo(kAVX2)) {
+  if (GetCPUInfo(kAVX2)) {
     filter =
         new FIRFilterAVX2(coefficients, coefficients_length, max_input_length);
-  } else if (WebRtc_GetCPUInfo(kSSE2)) {
+  } else if (GetCPUInfo(kSSE2)) {
     filter =
         new FIRFilterSSE2(coefficients, coefficients_length, max_input_length);
   } else {
diff --git a/common_audio/resampler/sinc_resampler.cc b/common_audio/resampler/sinc_resampler.cc
index 831ce53d4a..4fa78c5ede 100644
--- a/common_audio/resampler/sinc_resampler.cc
+++ b/common_audio/resampler/sinc_resampler.cc
@@ -127,9 +127,9 @@ void SincResampler::InitializeCPUSpecificFeatures() {
   convolve_proc_ = Convolve_NEON;
 #elif defined(WEBRTC_ARCH_X86_FAMILY)
   // Using AVX2 instead of SSE2 when AVX2 supported.
-  if (WebRtc_GetCPUInfo(kAVX2))
+  if (GetCPUInfo(kAVX2))
     convolve_proc_ = Convolve_AVX2;
-  else if (WebRtc_GetCPUInfo(kSSE2))
+  else if (GetCPUInfo(kSSE2))
     convolve_proc_ = Convolve_SSE;
   else
     convolve_proc_ = Convolve_C;
diff --git a/common_audio/resampler/sinc_resampler_unittest.cc b/common_audio/resampler/sinc_resampler_unittest.cc
index ece6af0689..5bfb2d090c 100644
--- a/common_audio/resampler/sinc_resampler_unittest.cc
+++ b/common_audio/resampler/sinc_resampler_unittest.cc
@@ -121,9 +121,9 @@ TEST(SincResamplerTest, DISABLED_SetRatioBench) {
 // will be tested by the parameterized SincResampler tests below.
 TEST(SincResamplerTest, Convolve) {
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-  ASSERT_TRUE(WebRtc_GetCPUInfo(kSSE2));
+  ASSERT_TRUE(GetCPUInfo(kSSE2));
 #elif defined(WEBRTC_ARCH_ARM_V7)
-  ASSERT_TRUE(WebRtc_GetCPUFeaturesARM() & kCPUFeatureNEON);
+  ASSERT_TRUE(GetCPUFeaturesARM() & kCPUFeatureNEON);
 #endif
 
   // Initialize a dummy resampler.
@@ -182,9 +182,9 @@ TEST(SincResamplerTest, ConvolveBenchmark) {
   printf("Convolve_C took %.2fms.\n", total_time_c_us / 1000);
 
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-  ASSERT_TRUE(WebRtc_GetCPUInfo(kSSE2));
+  ASSERT_TRUE(GetCPUInfo(kSSE2));
 #elif defined(WEBRTC_ARCH_ARM_V7)
-  ASSERT_TRUE(WebRtc_GetCPUFeaturesARM() & kCPUFeatureNEON);
+  ASSERT_TRUE(GetCPUFeaturesARM() & kCPUFeatureNEON);
 #endif
 
   // Benchmark with unaligned input pointer.
diff --git a/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc b/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc
index 6b6d6f1fd7..693312012b 100644
--- a/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc
+++ b/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc
@@ -323,7 +323,7 @@ OouraFft::OouraFft(bool sse2_available) {
 
 OouraFft::OouraFft() {
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-  use_sse2_ = (WebRtc_GetCPUInfo(kSSE2) != 0);
+  use_sse2_ = (GetCPUInfo(kSSE2) != 0);
 #else
   use_sse2_ = false;
 #endif
diff --git a/modules/audio_coding/codecs/isac/fix/source/isacfix.c b/modules/audio_coding/codecs/isac/fix/source/isacfix.c
index 36fbdd6bb8..067d8f358f 100644
--- a/modules/audio_coding/codecs/isac/fix/source/isacfix.c
+++ b/modules/audio_coding/codecs/isac/fix/source/isacfix.c
@@ -26,7 +26,6 @@
 #include "modules/audio_coding/codecs/isac/fix/source/filterbank_internal.h"
 #include "modules/audio_coding/codecs/isac/fix/source/lpc_masking_model.h"
 #include "modules/audio_coding/codecs/isac/fix/source/structs.h"
-#include "system_wrappers/include/cpu_features_wrapper.h"
 
 // Declare function pointers.
 FilterMaLoopFix WebRtcIsacfix_FilterMaLoopFix;
diff --git a/modules/audio_processing/aec3/adaptive_fir_filter_erl_unittest.cc b/modules/audio_processing/aec3/adaptive_fir_filter_erl_unittest.cc
index fc30f7fd74..d2af70a9f2 100644
--- a/modules/audio_processing/aec3/adaptive_fir_filter_erl_unittest.cc
+++ b/modules/audio_processing/aec3/adaptive_fir_filter_erl_unittest.cc
@@ -53,7 +53,7 @@ TEST(AdaptiveFirFilter, UpdateErlNeonOptimization) {
 // Verifies that the optimized method for echo return loss computation is
 // bitexact to the reference counterpart.
 TEST(AdaptiveFirFilter, UpdateErlSse2Optimization) {
-  bool use_sse2 = (WebRtc_GetCPUInfo(kSSE2) != 0);
+  bool use_sse2 = (GetCPUInfo(kSSE2) != 0);
   if (use_sse2) {
     const size_t kNumPartitions = 12;
     std::vector<std::array<float, kFftLengthBy2Plus1>> H2(kNumPartitions);
@@ -78,7 +78,7 @@ TEST(AdaptiveFirFilter, UpdateErlSse2Optimization) {
 // Verifies that the optimized method for echo return loss computation is
 // bitexact to the reference counterpart.
 TEST(AdaptiveFirFilter, UpdateErlAvx2Optimization) {
-  bool use_avx2 = (WebRtc_GetCPUInfo(kAVX2) != 0);
+  bool use_avx2 = (GetCPUInfo(kAVX2) != 0);
   if (use_avx2) {
     const size_t kNumPartitions = 12;
     std::vector<std::array<float, kFftLengthBy2Plus1>> H2(kNumPartitions);
diff --git a/modules/audio_processing/aec3/adaptive_fir_filter_unittest.cc b/modules/audio_processing/aec3/adaptive_fir_filter_unittest.cc
index a18ebd86a1..af7ea1d34c 100644
--- a/modules/audio_processing/aec3/adaptive_fir_filter_unittest.cc
+++ b/modules/audio_processing/aec3/adaptive_fir_filter_unittest.cc
@@ -179,7 +179,7 @@ TEST_P(AdaptiveFirFilterOneTwoFourEightRenderChannels,
   constexpr int kSampleRateHz = 48000;
   constexpr size_t kNumBands = NumBandsForRate(kSampleRateHz);
 
-  bool use_sse2 = (WebRtc_GetCPUInfo(kSSE2) != 0);
+  bool use_sse2 = (GetCPUInfo(kSSE2) != 0);
   if (use_sse2) {
     for (size_t num_partitions : {2, 5, 12, 30, 50}) {
       std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
@@ -254,7 +254,7 @@ TEST_P(AdaptiveFirFilterOneTwoFourEightRenderChannels,
   constexpr int kSampleRateHz = 48000;
   constexpr size_t kNumBands = NumBandsForRate(kSampleRateHz);
 
-  bool use_avx2 = (WebRtc_GetCPUInfo(kAVX2) != 0);
+  bool use_avx2 = (GetCPUInfo(kAVX2) != 0);
   if (use_avx2) {
     for (size_t num_partitions : {2, 5, 12, 30, 50}) {
       std::unique_ptr<RenderDelayBuffer> render_delay_buffer(
@@ -326,7 +326,7 @@ TEST_P(AdaptiveFirFilterOneTwoFourEightRenderChannels,
 TEST_P(AdaptiveFirFilterOneTwoFourEightRenderChannels,
        ComputeFrequencyResponseSse2Optimization) {
   const size_t num_render_channels = GetParam();
-  bool use_sse2 = (WebRtc_GetCPUInfo(kSSE2) != 0);
+  bool use_sse2 = (GetCPUInfo(kSSE2) != 0);
   if (use_sse2) {
     for (size_t num_partitions : {2, 5, 12, 30, 50}) {
       std::vector<std::vector<FftData>> H(
@@ -361,7 +361,7 @@ TEST_P(AdaptiveFirFilterOneTwoFourEightRenderChannels,
 TEST_P(AdaptiveFirFilterOneTwoFourEightRenderChannels,
        ComputeFrequencyResponseAvx2Optimization) {
   const size_t num_render_channels = GetParam();
-  bool use_avx2 = (WebRtc_GetCPUInfo(kAVX2) != 0);
+  bool use_avx2 = (GetCPUInfo(kAVX2) != 0);
   if (use_avx2) {
     for (size_t num_partitions : {2, 5, 12, 30, 50}) {
       std::vector<std::vector<FftData>> H(
diff --git a/modules/audio_processing/aec3/aec3_common.cc b/modules/audio_processing/aec3/aec3_common.cc
index 6aaab619fc..7bd8d6267a 100644
--- a/modules/audio_processing/aec3/aec3_common.cc
+++ b/modules/audio_processing/aec3/aec3_common.cc
@@ -20,9 +20,9 @@ namespace webrtc {
 
 Aec3Optimization DetectOptimization() {
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-  if (WebRtc_GetCPUInfo(kAVX2) != 0) {
+  if (GetCPUInfo(kAVX2) != 0) {
     return Aec3Optimization::kAvx2;
-  } else if (WebRtc_GetCPUInfo(kSSE2) != 0) {
+  } else if (GetCPUInfo(kSSE2) != 0) {
     return Aec3Optimization::kSse2;
   }
 #endif
diff --git a/modules/audio_processing/aec3/aec3_fft.cc b/modules/audio_processing/aec3/aec3_fft.cc
index d1d4f7da06..8dfa183367 100644
--- a/modules/audio_processing/aec3/aec3_fft.cc
+++ b/modules/audio_processing/aec3/aec3_fft.cc
@@ -73,7 +73,7 @@ const float kSqrtHanning128[kFftLength] = {
 
 bool IsSse2Available() {
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-  return WebRtc_GetCPUInfo(kSSE2) != 0;
+  return GetCPUInfo(kSSE2) != 0;
 #else
   return false;
 #endif
diff --git a/modules/audio_processing/aec3/fft_data_unittest.cc b/modules/audio_processing/aec3/fft_data_unittest.cc
index b0235a7fd0..d76fabdbd6 100644
--- a/modules/audio_processing/aec3/fft_data_unittest.cc
+++ b/modules/audio_processing/aec3/fft_data_unittest.cc
@@ -20,7 +20,7 @@ namespace webrtc {
 // Verifies that the optimized methods are bitexact to their reference
 // counterparts.
 TEST(FftData, TestSse2Optimizations) {
-  if (WebRtc_GetCPUInfo(kSSE2) != 0) {
+  if (GetCPUInfo(kSSE2) != 0) {
     FftData x;
 
     for (size_t k = 0; k < x.re.size(); ++k) {
@@ -43,7 +43,7 @@ TEST(FftData, TestSse2Optimizations) {
 // Verifies that the optimized methods are bitexact to their reference
 // counterparts.
 TEST(FftData, TestAvx2Optimizations) {
-  if (WebRtc_GetCPUInfo(kAVX2) != 0) {
+  if (GetCPUInfo(kAVX2) != 0) {
     FftData x;
 
     for (size_t k = 0; k < x.re.size(); ++k) {
diff --git a/modules/audio_processing/aec3/matched_filter_unittest.cc b/modules/audio_processing/aec3/matched_filter_unittest.cc
index 7e16c01ed9..137275fd74 100644
--- a/modules/audio_processing/aec3/matched_filter_unittest.cc
+++ b/modules/audio_processing/aec3/matched_filter_unittest.cc
@@ -93,7 +93,7 @@ TEST(MatchedFilter, TestNeonOptimizations) {
 // Verifies that the optimized methods for SSE2 are bitexact to their reference
 // counterparts.
 TEST(MatchedFilter, TestSse2Optimizations) {
-  bool use_sse2 = (WebRtc_GetCPUInfo(kSSE2) != 0);
+  bool use_sse2 = (GetCPUInfo(kSSE2) != 0);
   if (use_sse2) {
     Random random_generator(42U);
     constexpr float kSmoothing = 0.7f;
@@ -134,7 +134,7 @@ TEST(MatchedFilter, TestSse2Optimizations) {
 }
 
 TEST(MatchedFilter, TestAvx2Optimizations) {
-  bool use_avx2 = (WebRtc_GetCPUInfo(kAVX2) != 0);
+  bool use_avx2 = (GetCPUInfo(kAVX2) != 0);
   if (use_avx2) {
     Random random_generator(42U);
     constexpr float kSmoothing = 0.7f;
diff --git a/modules/audio_processing/aec3/vector_math_unittest.cc b/modules/audio_processing/aec3/vector_math_unittest.cc
index bd156b579c..a9c37e33cf 100644
--- a/modules/audio_processing/aec3/vector_math_unittest.cc
+++ b/modules/audio_processing/aec3/vector_math_unittest.cc
@@ -80,7 +80,7 @@ TEST(VectorMath, Accumulate) {
 #if defined(WEBRTC_ARCH_X86_FAMILY)
 
 TEST(VectorMath, Sse2Sqrt) {
-  if (WebRtc_GetCPUInfo(kSSE2) != 0) {
+  if (GetCPUInfo(kSSE2) != 0) {
     std::array<float, kFftLengthBy2Plus1> x;
     std::array<float, kFftLengthBy2Plus1> z;
     std::array<float, kFftLengthBy2Plus1> z_sse2;
@@ -102,7 +102,7 @@ TEST(VectorMath, Sse2Sqrt) {
 }
 
 TEST(VectorMath, Avx2Sqrt) {
-  if (WebRtc_GetCPUInfo(kAVX2) != 0) {
+  if (GetCPUInfo(kAVX2) != 0) {
     std::array<float, kFftLengthBy2Plus1> x;
     std::array<float, kFftLengthBy2Plus1> z;
     std::array<float, kFftLengthBy2Plus1> z_avx2;
@@ -124,7 +124,7 @@ TEST(VectorMath, Avx2Sqrt) {
 }
 
 TEST(VectorMath, Sse2Multiply) {
-  if (WebRtc_GetCPUInfo(kSSE2) != 0) {
+  if (GetCPUInfo(kSSE2) != 0) {
     std::array<float, kFftLengthBy2Plus1> x;
     std::array<float, kFftLengthBy2Plus1> y;
     std::array<float, kFftLengthBy2Plus1> z;
@@ -145,7 +145,7 @@ TEST(VectorMath, Sse2Multiply) {
 }
 
 TEST(VectorMath, Avx2Multiply) {
-  if (WebRtc_GetCPUInfo(kAVX2) != 0) {
+  if (GetCPUInfo(kAVX2) != 0) {
     std::array<float, kFftLengthBy2Plus1> x;
     std::array<float, kFftLengthBy2Plus1> y;
     std::array<float, kFftLengthBy2Plus1> z;
@@ -166,7 +166,7 @@ TEST(VectorMath, Avx2Multiply) {
 }
 
 TEST(VectorMath, Sse2Accumulate) {
-  if (WebRtc_GetCPUInfo(kSSE2) != 0) {
+  if (GetCPUInfo(kSSE2) != 0) {
     std::array<float, kFftLengthBy2Plus1> x;
     std::array<float, kFftLengthBy2Plus1> z;
     std::array<float, kFftLengthBy2Plus1> z_sse2;
@@ -186,7 +186,7 @@ TEST(VectorMath, Sse2Accumulate) {
 }
 
 TEST(VectorMath, Avx2Accumulate) {
-  if (WebRtc_GetCPUInfo(kAVX2) != 0) {
+  if (GetCPUInfo(kAVX2) != 0) {
     std::array<float, kFftLengthBy2Plus1> x;
     std::array<float, kFftLengthBy2Plus1> z;
     std::array<float, kFftLengthBy2Plus1> z_avx2;
diff --git a/modules/audio_processing/agc2/rnn_vad/common.cc b/modules/audio_processing/agc2/rnn_vad/common.cc
index 744c87fea2..5d76b52e57 100644
--- a/modules/audio_processing/agc2/rnn_vad/common.cc
+++ b/modules/audio_processing/agc2/rnn_vad/common.cc
@@ -18,7 +18,7 @@ namespace rnn_vad {
 
 Optimization DetectOptimization() {
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-  if (WebRtc_GetCPUInfo(kSSE2) != 0) {
+  if (GetCPUInfo(kSSE2) != 0) {
     return Optimization::kSse2;
   }
 #endif
diff --git a/modules/audio_processing/agc2/rnn_vad/test_utils.cc b/modules/audio_processing/agc2/rnn_vad/test_utils.cc
index 1a8e1a2eeb..c7bf02e74b 100644
--- a/modules/audio_processing/agc2/rnn_vad/test_utils.cc
+++ b/modules/audio_processing/agc2/rnn_vad/test_utils.cc
@@ -109,7 +109,7 @@ bool IsOptimizationAvailable(Optimization optimization) {
   switch (optimization) {
     case Optimization::kSse2:
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-      return WebRtc_GetCPUInfo(kSSE2) != 0;
+      return GetCPUInfo(kSSE2) != 0;
 #else
       return false;
 #endif
diff --git a/modules/audio_processing/agc2/signal_classifier.cc b/modules/audio_processing/agc2/signal_classifier.cc
index 38334f7ec5..a06413d166 100644
--- a/modules/audio_processing/agc2/signal_classifier.cc
+++ b/modules/audio_processing/agc2/signal_classifier.cc
@@ -26,7 +26,7 @@ namespace {
 
 bool IsSse2Available() {
 #if defined(WEBRTC_ARCH_X86_FAMILY)
-  return WebRtc_GetCPUInfo(kSSE2) != 0;
+  return GetCPUInfo(kSSE2) != 0;
 #else
   return false;
 #endif
diff --git a/modules/desktop_capture/differ_block.cc b/modules/desktop_capture/differ_block.cc
index dd9ab457e0..4f0c5430c9 100644
--- a/modules/desktop_capture/differ_block.cc
+++ b/modules/desktop_capture/differ_block.cc
@@ -35,7 +35,7 @@ bool VectorDifference(const uint8_t* image1, const uint8_t* image2) {
     // TODO(hclam): Implement a NEON version.
     diff_proc = &VectorDifference_C;
 #else
-    bool have_sse2 = WebRtc_GetCPUInfo(kSSE2) != 0;
+    bool have_sse2 = GetCPUInfo(kSSE2) != 0;
     // For x86 processors, check if SSE2 is supported.
     if (have_sse2 && kBlockSize == 32) {
       diff_proc = &VectorDifference_SSE2_W32;
diff --git a/modules/video_processing/util/denoiser_filter.cc b/modules/video_processing/util/denoiser_filter.cc
index d6b5094a5b..0e1570114a 100644
--- a/modules/video_processing/util/denoiser_filter.cc
+++ b/modules/video_processing/util/denoiser_filter.cc
@@ -41,7 +41,7 @@ std::unique_ptr<DenoiserFilter> DenoiserFilter::Create(
     filter.reset(new DenoiserFilterSSE2());
 #else
     // x86 CPU detection required.
-    if (WebRtc_GetCPUInfo(kSSE2)) {
+    if (GetCPUInfo(kSSE2)) {
       filter.reset(new DenoiserFilterSSE2());
     } else {
       filter.reset(new DenoiserFilterC());
diff --git a/system_wrappers/include/cpu_features_wrapper.h b/system_wrappers/include/cpu_features_wrapper.h
index f4b3fed2d3..612b4a5d6b 100644
--- a/system_wrappers/include/cpu_features_wrapper.h
+++ b/system_wrappers/include/cpu_features_wrapper.h
@@ -13,6 +13,8 @@
 
 #include <stdint.h>
 
+namespace webrtc {
+
 // List of features in x86.
 typedef enum { kSSE2, kSSE3, kAVX2 } CPUFeature;
 
@@ -24,17 +26,17 @@ enum {
   kCPUFeatureLDREXSTREX = (1 << 3)
 };
 
-typedef int (*WebRtc_CPUInfo)(CPUFeature feature);
-
 // Returns true if the CPU supports the feature.
-extern WebRtc_CPUInfo WebRtc_GetCPUInfo;
+int GetCPUInfo(CPUFeature feature);
 
 // No CPU feature is available => straight C path.
-extern WebRtc_CPUInfo WebRtc_GetCPUInfoNoASM;
+int GetCPUInfoNoASM(CPUFeature feature);
 
 // Return the features in an ARM device.
 // It detects the features in the hardware platform, and returns supported
 // values in the above enum definition as a bitmask.
-extern uint64_t WebRtc_GetCPUFeaturesARM(void);
+uint64_t GetCPUFeaturesARM(void);
+
+}  // namespace webrtc
 
 #endif  // SYSTEM_WRAPPERS_INCLUDE_CPU_FEATURES_WRAPPER_H_
diff --git a/system_wrappers/source/cpu_features.cc b/system_wrappers/source/cpu_features.cc
index 40110ed871..e40c65a191 100644
--- a/system_wrappers/source/cpu_features.cc
+++ b/system_wrappers/source/cpu_features.cc
@@ -17,6 +17,8 @@
 #include <intrin.h>
 #endif
 
+namespace webrtc {
+
 // No CPU feature is available => straight C path.
 int GetCPUInfoNoASM(CPUFeature feature) {
   (void)feature;
@@ -65,7 +67,7 @@ static inline void __cpuid(int cpu_info[4], int info_type) {
 
 #if defined(WEBRTC_ARCH_X86_FAMILY)
 // Actual feature detection for x86.
-static int GetCPUInfo(CPUFeature feature) {
+int GetCPUInfo(CPUFeature feature) {
   int cpu_info[4];
   __cpuid(cpu_info, 1);
   if (feature == kSSE2) {
@@ -102,11 +104,10 @@ static int GetCPUInfo(CPUFeature feature) {
 }
 #else
 // Default to straight C for other platforms.
-static int GetCPUInfo(CPUFeature feature) {
+int GetCPUInfo(CPUFeature feature) {
   (void)feature;
   return 0;
 }
 #endif
 
-WebRtc_CPUInfo WebRtc_GetCPUInfo = GetCPUInfo;
-WebRtc_CPUInfo WebRtc_GetCPUInfoNoASM = GetCPUInfoNoASM;
+}  // namespace webrtc
diff --git a/system_wrappers/source/cpu_features_android.cc b/system_wrappers/source/cpu_features_android.cc
index 0cb3a6c5ee..95cc609b09 100644
--- a/system_wrappers/source/cpu_features_android.cc
+++ b/system_wrappers/source/cpu_features_android.cc
@@ -10,6 +10,10 @@
 
 #include <cpu-features.h>
 
-uint64_t WebRtc_GetCPUFeaturesARM(void) {
+namespace webrtc {
+
+uint64_t GetCPUFeaturesARM(void) {
   return android_getCpuFeatures();
 }
+
+}  // namespace webrtc
diff --git a/system_wrappers/source/cpu_features_linux.cc b/system_wrappers/source/cpu_features_linux.cc
index 05ff9b31b7..335bed4da3 100644
--- a/system_wrappers/source/cpu_features_linux.cc
+++ b/system_wrappers/source/cpu_features_linux.cc
@@ -33,7 +33,9 @@
 #if defined(WEBRTC_ARCH_ARM_FAMILY)
 #include <asm/hwcap.h>
 
-uint64_t WebRtc_GetCPUFeaturesARM(void) {
+namespace webrtc {
+
+uint64_t GetCPUFeaturesARM(void) {
   uint64_t result = 0;
   int architecture = 0;
   uint64_t hwcap = 0;
@@ -89,4 +91,6 @@ uint64_t WebRtc_GetCPUFeaturesARM(void) {
     result |= kCPUFeatureLDREXSTREX;
   return result;
 }
+
+}  // namespace webrtc
 #endif  // WEBRTC_ARCH_ARM_FAMILY