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Prevents having two places where codecs etc. are set up and allows us to avoid creating the underlying VideoSendStream before send codecs are set up. BUG=1788 R=pthatcher@webrtc.org Review URL: https://webrtc-codereview.appspot.com/20939004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6716 4adac7df-926f-26a2-2b94-8c16560cd09d