Revert 8532 "Ensure only temporary IPv6 address is selected as t..."

> Ensure only temporary IPv6 address is selected as the best IP.
> 
> The current logic of IPv6 selection could still have a small chance for non-temporary address to be selected for candidate. The scenario is that when there is no non-deprecated temporary IP, the global ones could be selected.
> 
> Global ones don't necessarily carry MAC. However, instead of comparing whether it has the MAC in it (sometimes 5 out of 6 elements from a MAC are the same, only one diffs), we should just err on the safe side.
> 
> BUG=4348
> R=juberti@webrtc.org, pthatcher@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/38289004

TBR=guoweis@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/38319004

Cr-Commit-Position: refs/heads/master@{#8534}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8534 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed