Merge third_party/libjingle/source/talk from https://chromium.googlesource.com/external/webrtc/trunk/talk.git at 4fb0d5af90819ec9666b847f6295b933f58c8301

This commit was generated by merge_from_chromium.py.

Change-Id: I9300049afc40d0a2f93ff9ffcb144ca3c68863d7