Revert 226054 "Roll webrtc to r4883."

> Roll webrtc to r4883.
> 
> R=ronghuawu@chromium.org
> 
> Review URL: https://codereview.chromium.org/25106005

TBR=mallinath@chromium.org

Review URL: https://codereview.chromium.org/25380003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226076 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226076