1c27c6bf4c
(And similarly for U and V). Also change video_frame_buffer method to return a const ref to a scoped_ref_ptr. This cl is analogous to https://codereview.webrtc.org/1900673002/, which delete corresponding methods in webrtc::VideoFrame. BUG=webrtc:5682 Review URL: https://codereview.webrtc.org/1901973002 Cr-Commit-Position: refs/heads/master@{#12492}