Suppression for WebRtcVideoChannel2BaseTest.SetSendSsrc.

BUG=3336
R=mallinath@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/15479005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6106 4adac7df-926f-26a2-2b94-8c16560cd09d