Merge third_party/webrtc from https://chromium.googlesource.com/external/webrtc/trunk/webrtc.git at 34374d1ea3f56216836788b7378c69a540fe9197

This commit was generated by merge_from_chromium.py.

Change-Id: Ie01094518bf66b1482b596f901b6466d23bc353e