Merge third_party/libjingle/source/talk from https://chromium.googlesource.com/external/webrtc/trunk/talk.git at 9460de62505246d2f0a8b89319b946457c9ef086

This commit was generated by merge_from_chromium.py.

Change-Id: I23a8f1e92b7387336aee826f12f4db190b4b779b