WebRTC filenames use underscores to separate words so the ssl roots
file is rtc_base/ssl_roots.h instead of rtc_base/sslroots.h.
Bug: chromium:978779
Change-Id: I2fa11c38a566e177775deb3d42230d956efc8ccc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/173800
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31132}