Revert 8753 "Use atomic operations for setting/reading the trace..."
Caused VP9 test to fail on TSAN and doesn't build in some configuration due to
"../webrtc/base/criticalsection.h:181:12: error: cannot compile this atomic library call yet"
:-(

> Use atomic operations for setting/reading the trace filter.
> The filter is currently being set and read by a number of threads and tripping up tsan.
> 
> R=mflodman@webrtc.org
> BUG=
> 
> Review URL: https://webrtc-codereview.appspot.com/47609004

TBR=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/51369004

Cr-Commit-Position: refs/heads/master@{#8759}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8759 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed