Revert 255846 "MediaStream VideoTrack implementation."
This is causing problems in the video stream when audio devices
(input or output) is switched.
BUG=351949,334241
> MediaStream VideoTrack implementation.
> This implementation only use Chrome video classes for local rendering.
> A libjingle representation is created once its connected to a PeerConnection.
>
>
> BUG=334241
>
> Review URL: https://codereview.chromium.org/
155853002
TBR=perkj@chromium.org
Review URL: https://codereview.chromium.org/
198353002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256699 0039d316-1c4b-4281-b951-d872f2087c98