More thorough refactoring work is planned for RTCVideoFrame (see webrtc:7785), and this CL just unblocks removing the old interface from webrtc::VideoFrameBuffer. Bug: webrtc:7632,webrtc:7785 Change-Id: I351536c5ca454c2acd8944bbc2ebb1d1439dc50c Reviewed-on: https://chromium-review.googlesource.com/530231 Reviewed-by: Anders Carlsson <andersc@webrtc.org> Commit-Queue: Magnus Jedvert <magjed@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18553}