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Reduces stream creation time significantly. As a side effect also removes default encoders for receive-only channels. BUG=1788,1667 R=stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/37049004 Cr-Commit-Position: refs/heads/master@{#8356} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8356 4adac7df-926f-26a2-2b94-8c16560cd09d