Removed ThreadWatcher TSan suppressions.  The following CL should fix the TSan errors.
Removed ThreadWatcher TSan suppressions. 
The following CL should fix the TSan errors.

 http://codereview.chromium.org/7218030

BUG=83564, 89141, 86818
TEST=ThreadWatcher unit tests
R=thestig
Review URL: http://codereview.chromium.org/7377011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@92703 0039d316-1c4b-4281-b951-d872f2087c98

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