Chromium's trace_event.h has updated to remove some not-well-used features. Update WebRTC's copy to match. Review URL: https://webrtc-codereview.appspot.com/995006 git-svn-id: http://webrtc.googlecode.com/svn/trunk@3296 4adac7df-926f-26a2-2b94-8c16560cd09d