Reland of Move MutableDataY{,U,V} methods to I420Buffer only. (patchset #1 id:1 of https://codereview.webrtc.org/2354223002/ )
Reason for revert:
Downstream application now fixed.
Original issue's description:
> Revert of Move MutableDataY{,U,V} methods to I420Buffer only. (patchset #14 id:260001 of https://codereview.webrtc.org/2278883002/ )
>
> Reason for revert:
> Broke downstream application.
>
> Original issue's description:
> > Move MutableDataY{,U,V} methods to I420Buffer only.
> >
> > Deleted from the VideoFrameBuffer base class.
> >
> > BUG=webrtc:5921
> >
> > Committed: https://crrev.com/5539ef6c03c273f39fadae41ace47fdc11ac6d60
> > Cr-Commit-Position: refs/heads/master@{#14317}
>
> TBR=perkj@webrtc.org,magjed@webrtc.org,pthatcher@webrtc.org,honghaiz@webrtc.org,stefan@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:5921
>
> Committed: https://crrev.com/776870a2599b8f43ad56987f9031690e3ccecde8
> Cr-Commit-Position: refs/heads/master@{#14325}
TBR=perkj@webrtc.org,magjed@webrtc.org,pthatcher@webrtc.org,honghaiz@webrtc.org,stefan@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=webrtc:5921
Review-Url: https://codereview.webrtc.org/2372483002
Cr-Commit-Position: refs/heads/master@{#14389}
64ec8f826f