GN: Move variables from //build_overrides/webrtc.gni to //webrtc/build/webrtc.gni

There is no clear reason to have them in build_overrides, and
webrtc/build seems to be a better place.

Also, delete build_overrides/webrtc.gni

NOTRY=True
BUG=webrtc:5949

Review-Url: https://codereview.webrtc.org/2309253004
Cr-Commit-Position: refs/heads/master@{#14108}

build_overrides/webrtc.gni

@@ -1,29 +0,0 @@
-# Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
-#
-# Use of this source code is governed by a BSD-style license
-# that can be found in the LICENSE file in the root of the source
-# tree. An additional intellectual property rights grant can be found
-# in the file PATENTS.  All contributing project authors may
-# be found in the AUTHORS file in the root of the source tree.
-
-# This file contains overrides to GN variables that applies for the WebRTC
-# standalone build (i.e. not in Chromium).
-#
-# Every variable here needs to be present in the corresponding file in
-# build_overrides/ of Chromium.
-
-# The build_with_chromium variable is now located in build.gni (now also used
-# by BoringSSL).
-import("//build_overrides/build.gni")
-
-# Excluded in Chromium since its prerequisites don't require Pulse Audio.
-rtc_include_pulse_audio = true
-
-# Chromium uses its own IO handling, so the internal ADM is only built for
-# standalone WebRTC.
-rtc_include_internal_audio_device = true
-
-declare_args() {
-  # Include tests in standalone checkout.
-  rtc_include_tests = true
-}

webrtc/base/BUILD.gn

@@ -10,8 +10,6 @@ import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
 import("../build/webrtc.gni")
 
-import("//build_overrides/webrtc.gni")
-
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")

webrtc/build/webrtc.gni

@@ -10,7 +10,7 @@ import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
-import("//build_overrides/webrtc.gni")
+import("//build_overrides/build.gni")
 import("//testing/test.gni")
 
 declare_args() {
@@ -143,6 +143,16 @@ declare_args() {
   rtc_include_ilbc = !(build_with_chromium || build_with_mozilla)
 
   rtc_restrict_logging = build_with_chromium
+
+  # Excluded in Chromium since its prerequisites don't require Pulse Audio.
+  rtc_include_pulse_audio = !build_with_chromium
+
+  # Chromium uses its own IO handling, so the internal ADM is only built for
+  # standalone WebRTC.
+  rtc_include_internal_audio_device = !build_with_chromium
+
+  # Include tests in standalone checkout.
+  rtc_include_tests = !build_with_chromium
 }
 
 # Make it possible to provide custom locations for some libraries (move these

webrtc/sdk/BUILD.gn

@@ -7,7 +7,6 @@
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
-import("//build_overrides/webrtc.gni")
 import("//build/config/mac/mac_sdk.gni")
 
 if (is_ios || (is_mac && mac_deployment_target == "10.7")) {

webrtc/test/fuzzers/BUILD.gn

@@ -8,7 +8,6 @@
 
 import("../../build/webrtc.gni")
 import("//build/config/features.gni")
-import("//build_overrides/webrtc.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
 rtc_static_library("webrtc_fuzzer_main") {