tommi@webrtc.org c7157da599 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.

Original review: https://webrtc-codereview.appspot.com/47609004/

R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/47659004

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git-svn-id: http://webrtc.googlecode.com/svn/trunk@8789 4adac7df-926f-26a2-2b94-8c16560cd09d
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