The only real implementation of VideoRenderer.Callbacks, VideoRendererGui, can always apply rotation. We don't need this in the interface. BUG=webrtc:4145 R=glaznev@webrtc.org, guoweis@webrtc.org Review URL: https://codereview.webrtc.org/1306073003 . Cr-Commit-Position: refs/heads/master@{#9772}