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If the local port and the remote candidate's protocols do not match, do not even try to pair them. This avoids printing out confusing logs like "Attempt to change a remote candidate..." in p2ptransportchannel when two remote candidates have the same port number but different protocols. BUG= R=pthatcher@webrtc.org Review URL: https://codereview.webrtc.org/1516613002 . Cr-Commit-Position: refs/heads/master@{#11034}