Remove stale MockVideoCaptureImpl TSan suppression

Per the bug, this was fixed in
https://codereview.chromium.org/138953009, so remove the suppression

Bug: 333244
Change-Id: I7543735e2db6215cd5c37add9571af70c87e947d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627266
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#667454}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: d002482812543721350531defe44727a16640b83

sanitizers/tsan_suppressions.cc

@@ -110,10 +110,6 @@ char kTSanDefaultSuppressions[] =
     // http://crbug.com/328868
     "race:PR_Lock\n"
 
-    // http://crbug.com/333244
-    "race:content::"
-    "VideoCaptureImplTest::MockVideoCaptureImpl::~MockVideoCaptureImpl\n"
-
     // http://crbug.com/347538
     "race:sctp_timer_start\n"