Merge third_party/libjingle/source/talk from https://chromium.googlesource.com/external/webrtc/trunk/talk.git at 2ce4efe64e83181207479911164695a41302276a

This commit was generated by merge_from_chromium.py.

Change-Id: Ic2097a890ef4728501743cd0190251e4d3bf019c