Remove stale suppression

TracingControllerImpl::SetEnabledOnFileThread has not existed since
https://chromium-review.googlesource.com/611188.

Bug: 490856
Change-Id: I3c2bcad754242d187693bdc451af372be0cae646
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666944
Commit-Queue: David Benjamin <davidben@chromium.org>
Commit-Queue: oysteine <oysteine@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#670590}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6f269f912574c0b6e51fcc6e7065433bccd82c07

sanitizers/tsan_suppressions.cc

@@ -124,9 +124,6 @@ char kTSanDefaultSuppressions[] =
     // http://crbug.com/415472
     "deadlock:base::trace_event::TraceLog::GetCategoryGroupEnabled\n"
 
-    // http://crbug.com/490856
-    "deadlock:content::TracingControllerImpl::SetEnabledOnFileThread\n"
-
     // Lock inversion in third party code, won't fix.
     // https://crbug.com/455638
     "deadlock:dbus::Bus::ShutdownAndBlock\n"