Widen an existing suppression a little bit...

tools/valgrind/tsan/suppressions_mac.txt

 # There are two 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 # running overnight and removing outdated bugs/suppressions.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 83 matching lines @@
 
 {
   Benign data race in CAMutex bug_23579
   ThreadSanitizer:Race
   fun:*CAMutex*ock*
 }
 
 {
   A warning on destruction of third party ClientAudioQueue object (AudioToolbox)
   ThreadSanitizer:Race
+  ...
   fun:*AQClient*CheckDisposal*
   fun:*ClientAudioQueueD*
   fun:AudioQueueDispose
 }
 
 #-----------------------------------------------------------------------
 # 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
 
 {
   Benign data race inside PCMQueueOutAudioOutputStream::Stop bug_24801
   ThreadSanitizer:Race
   fun:*PCMQueueOutAudioOutputStream*Stop*
 }
 
 #-----------------------------------------------------------------------
 # 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 # running overnight and removing outdated bugs/suppressions.
 
 # Nothing here yet, but updates will be submitted soon.