Fix unused-variable warning in Release.
Fix unused-variable warning in Release.

TBR=mflodman@webrtc.org
TEST=Build Debug/Release on Linux

Review URL: http://webrtc-codereview.appspot.com/338003

git-svn-id: 9b397c5dfe384c04b1b200d5305b653241000171@1316 4adac7df-926f-26a2-2b94-8c16560cd09d

lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override