Merge third_party/libjingle/source/talk from https://chromium.googlesource.com/external/webrtc/trunk/talk.git at b25f2cd3bd9b8444d2a1d48ca26e2721b42c78e1

This commit was generated by merge_from_chromium.py.

Change-Id: I3c55437f08741cdd874f85672c334aaf12ab2fd2