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Make sure the IP family overwrites the preference of candidates. Also, make sure only UDP is used as default destination. BUG=4269 R=juberti@webrtc.org Review URL: https://webrtc-codereview.appspot.com/36009004 Cr-Commit-Position: refs/heads/master@{#8258} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8258 4adac7df-926f-26a2-2b94-8c16560cd09d