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RTCVideoRenderer should be a protocol not a class. This change includes an adapter for use with the C++ apis. The video views have been refactored to implement that protocol. BUG=3795 R=glaznev@webrtc.org Review URL: https://webrtc-codereview.appspot.com/23279004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7626 4adac7df-926f-26a2-2b94-8c16560cd09d