Avoids deadlock in WebRtcLocalAudioRenderer.

BUG=208580
TEST=apprtc.com in loopback

Review URL: https://chromiumcodereview.appspot.com/12769010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@188718 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed