Reason for revert:
Breaks chrome, in particular, the tests in
media_stream_remote_video_source_unittest.cc
use the InitToBlack method which is being deleted.
Original issue's description:
> New static method I420Buffer::SetToBlack.
>
> Replaces cricket::VideoFrame::SetToBlack and
> cricket::WebRtcVideoFrame::InitToBlack, which are deleted.
>
> Refactors the black frame logic in VideoBroadcaster, and a few of the
> tests.
>
> BUG=webrtc:5682
>
> Committed: https://crrev.com/663f9e2ddc86e813f6db04ba2cf5ac1ed9e7ef67
> Cr-Commit-Position: refs/heads/master@{#13063}
TBR=perkj@webrtc.org,pbos@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5682
Review-Url: https://codereview.webrtc.org/2049023002
Cr-Commit-Position: refs/heads/master@{#13065}
271d740788