Disable UsesTraceCallback

Ongoing removal of trace code is causing UsesTraceCallback to fail,
disabling it for now.

BUG=3157
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/11629004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5882 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed