Revert r7858 ("DCHECK: Reference condition parameter in release builds")

Apparently Visual Studio is cleverer than I am at figuring out what
local variables are actually unused.

TBR=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/32739004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@7859 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed