Fix ThreadSanitizer suppressions...

tools/valgrind/tsan/suppressions.txt

 ############################
 # Chromium
 
 {
   bug_21468
   ThreadSanitizer:Race
   ...
   fun:*net*DirectoryLister*
 }
 
@@ skipping 103 matching lines @@
   ThreadSanitizer:Race
   fun:*talk_base*MessageQueue*Get*
 }
 
 {
   bug_25913 (libjingle) (3)
   ThreadSanitizer:Race
   fun:*talk_base*MessageQueue*Quit*
 }
 
+{
+  bug_28765 (tcmalloc)
+  ThreadSanitizer:Race
+  ...
+  fun:*tcmalloc*ThreadCache*DeleteCache*
+}
+
 ############################
 # Data races in tests
 
 # TODO(timurrrr): bug item
 {
   Data race on bool in base/thread_unittest
   ThreadSanitizer:Race
   ...
   fun:*ToggleValue*Run*
 }
@@ skipping 137 matching lines @@
 # gethostbyname2_r is thread-safe, however ThreadSanitizer reports races inside it and
 # (sometimes) in __nss_* functions below it.
 # This may be related to
 # https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/59449
 {
   Race reports below thread-safe gethostbyname2_r
   ThreadSanitizer:Race
   ...
   fun:gethostbyname2_r*
 }
-
-############################
-# Races in TCMalloc (probably benign)
-{
-  TCMalloc1
-  ThreadSanitizer:Race
-  ...
-  tcmalloc::ThreadCache::DeleteCache
-}