Merge third_party/libjingle/source/talk from https://chromium.googlesource.com/external/webrtc/trunk/talk.git at 19c8d5c35a3e7a7341124f3865a3a117985e7c08

This commit was generated by merge_from_chromium.py.

Change-Id: I75181570213a02c85bd866a22896805d4b1f966f