Add *_test_util.* to whitelist for test-only presubmit check.

BUG=none


Review URL: http://codereview.chromium.org/9460063

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@123871 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index d0305ee..cc289b4 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -64,7 +64,7 @@
   file_inclusion_pattern = r'.+%s' % source_extensions
   file_exclusion_patterns = (
       r'.*[/\\](test_|mock_).+%s' % source_extensions,
-      r'.+_test_(support|base)%s' % source_extensions,
+      r'.+_test_(base|support|util)%s' % source_extensions,
       r'.+_(api|browser|perf|unit|ui)?test%s' % source_extensions,
       r'.+profile_sync_service_harness%s' % source_extensions,
       )