Suppress data races on ~BrowserThread

tools/valgrind/tsan/suppressions.txt

 # There are a few kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 614 matching lines @@
    fun:disk_cache::BackendImpl::MatchEntry
    fun:disk_cache::BackendImpl::InternalDoomEntry
 }
 {
   bug_101853_d
   ThreadSanitizer:Race
   fun:disk_cache::BackendImpl::GetEntryCount
   fun:DiskCacheBackendTest::BackendTrimInvalidEntry2
   fun:DiskCacheBackendTest_*
 }
+{
+  bug_102134a
+  ThreadSanitizer:Race
+  fun:content::BrowserThreadImpl::~BrowserThreadImpl
+  fun:content::TestBrowserThread::~TestBrowserThread
+}
+{
+  bug_102134b
+  ThreadSanitizer:Race
+  fun:BrowserThread::~BrowserThread
+  fun:DeprecatedBrowserThread::~DeprecatedBrowserThread
+}