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This cl cleans up the video receiver from handling the raw
frames, and will align the frame handling of the cast vp8
decoder and the chromium/ffmpeg h264 decoder (to be added).

Review URL: https://codereview.chromium.org/59753007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233396 0039d316-1c4b-4281-b951-d872f2087c98