9f8164c06054016978378b7a01a9180106d92771

1. OnStateChange should not be fired if state is not changed. 2. RemotePeerRequestClose should be a no-op if it's already closed. TBR=pthatcher@webrtc.org BUG= Review URL: https://webrtc-codereview.appspot.com/21559004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6290 4adac7df-926f-26a2-2b94-8c16560cd09d
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