tsan_suppressions: remove vp9 suppression

The fix was picked up in the r282874 libvpx roll.
BUG=350982

Review URL: https://codereview.chromium.org/423643002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285807 0039d316-1c4b-4281-b951-d872f2087c98

base/debug/tsan_suppressions.cc

@@ -253,9 +253,6 @@ char kTSanDefaultSuppressions[] =
 "race:sctp_express_handle_sack\n"
 "race:system_base_info\n"
 
-// http://crbug.com/350982
-"race:libvpx/vp9/decoder/vp9_thread.c\n"
-
 // http://crbug.com/363999
 "race:v8::internal::EnterDebugger::*EnterDebugger\n"