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In tcp only call: Tested with hangout. Tested with firefox. To test firefox, goto about:config, search for media.peerconnection.ice.tcp and turn it on. Existing test case should be suffice to cover this. R=juberti@google.com TBR=jubert@webrtc.org BUG=webrtc:3849 Review URL: https://codereview.webrtc.org/1217463004 . Cr-Commit-Position: refs/heads/master@{#10683}