GetWidth and GetHeight (renamed to width and height), GetNativeHandle (replaced by video_frame_buffer()->native_handle). TBR=tkchin@webrtc.org (trivial changes to objc RTCVideoFrame and VideoRendererAdapter) BUG=webrtc:5682 Review-Url: https://codereview.webrtc.org/1990063005 Cr-Commit-Position: refs/heads/master@{#12822}