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Tests basic session ICE connection by stubbing out network components, which have been refactored to faciliate testing. BUG=3994 R=jiayl@webrtc.org, kjellander@webrtc.org, phoglund@webrtc.org Review URL: https://webrtc-codereview.appspot.com/28349004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@8002 4adac7df-926f-26a2-2b94-8c16560cd09d