Speculatively remove V8 shutdown TSan suppression

The last comment on the bug suggests this is no longer applicable. If
so, we should remove the suppression.

Bug: 347534
Change-Id: I9da64043c95c167a5cab72f09645f6db9a3a50f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625099
Commit-Queue: Adam Klein <adamk@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662558}

build/sanitizers/tsan_suppressions.cc

@@ -117,9 +117,6 @@ char kTSanDefaultSuppressions[] =
     "race:content::"
     "VideoCaptureImplTest::MockVideoCaptureImpl::~MockVideoCaptureImpl\n"
 
-    // http://crbug.com/347534
-    "race:v8::internal::V8::TearDown\n"
-
     // http://crbug.com/347538
     "race:sctp_timer_start\n"