honghaiz 84430da681 When doing candidate re-gathering in the same generation, Remove the existing local candidate on the same network
and signaling the remote side to remove its remote candidate by setting the candidate priority to 0.

BUG=

Review URL: https://codereview.webrtc.org/1648813004

Cr-Commit-Position: refs/heads/master@{#11958}
2016-03-11 21:28:12 +00:00
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