Remove ThreadSanitizer suppression for 22272.

The race was specific to unit-test code (see r29826) and should be fixed now.

BUG=22272

Review URL: http://codereview.chromium.org/293042

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30301 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/tsan/suppressions.txt

@@ -15,13 +15,6 @@
   fun:*net*DirectoryLister*
 }
 
-{
-  bug_22272
-  ThreadSanitizer:Race
-  ...
-  fun:*RefCounted*LoadLog*
-}
-
 {
   bug_22520
   ThreadSanitizer:Race