Suppress TSan deadlock report.

BUG=415472
TBR=thestig@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/576493003

Cr-Original-Commit-Position: refs/heads/master@{#295440}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 2236bc6c42e32f783530c97477c7270e02ff0e78

sanitizers/tsan_suppressions.cc

@@ -301,6 +301,9 @@ char kTSanDefaultSuppressions[] =
 "deadlock:"
 "base::debug::TraceEventTestFixture_ThreadOnceBlocking_Test::TestBody\n"
 
+// http://crbug.com/415472
+"deadlock:base::debug::TraceLog::GetCategoryGroupEnabled\n"
+
 // End of suppressions.
 ;  // Please keep this semicolon.