Change VideoDecoder::ReadCB to take const scoped_refptr<VideoFrame>&.

BUG=none
TEST=media_unittests, media layout tests.


Review URL: https://chromiumcodereview.appspot.com/10559074

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@143192 0039d316-1c4b-4281-b951-d872f2087c98
void VideoRendererBase::DoStopOrError_Locked() {
  DCHECK(!pending_paint_);
  DCHECK(!pending_paint_with_last_available_);
  lock_.AssertAcquired();
  current_frame_ = NULL;
  last_available_frame_ = NULL;
  ready_frames_.clear();
}

void VideoRendererBase::DoStopOrError_Locked() {
  DCHECK(!pending_paint_);
  DCHECK(!pending_paint_with_last_available_);
  lock_.AssertAcquired();
  current_frame_ = NULL;
  last_available_frame_ = NULL;
  ready_frames_.clear();
}
