Suppress data races on ~BrowserThread

BUG=102134
TBR=hbono
TEST=TSan bots mostly green
Review URL: http://codereview.chromium.org/8341136

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107877 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/tsan/suppressions.txt

@@ -632,3 +632,15 @@
   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
+}