Revert 8238 "Add RefCounting for TransportProxies"

Failing on Mac64_Debug

> Add RefCounting for TransportProxies
> 
> BUG=1574
> R=pthatcher@webrtc.org
> 
> Review URL: https://webrtc-codereview.appspot.com/37869004

TBR=decurtis@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/37159004

Cr-Commit-Position: refs/heads/master@{#8243}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8243 4adac7df-926f-26a2-2b94-8c16560cd09d
5 files changed