Fix WebRTC IP leaks.
Fix WebRTC IP leaks.

WebRTC binds to individual NICs and listens for incoming Stun packets. Sending stun through this specific NIC binding could make OS route the packet differently hence exposing non-VPN public IP.

The fix here is
1. to bind to any address (0:0:0:0) instead. This way, the routing will be the same as how chrome/http is.
2. also, remove the any all 0s addresses which happens when we bind to all 0s.

BUG=4276
R=juberti@webrtc.org

Committed: https://code.google.com/p/webrtc/source/detail?r=8418

Committed: https://code.google.com/p/webrtc/source/detail?r=8419

Review URL: https://webrtc-codereview.appspot.com/39129004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@8420 4adac7df-926f-26a2-2b94-8c16560cd09d

svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758,svn2github/webrtc-Revision-8758