TSAN: Suppress an error in tracked_objects::ThreadData.

BUG=309847
NOTRY=true
TBR=glider@chromium.org

Review URL: https://codereview.chromium.org/126513008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243471 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243471