Fix test for files starting with test_ and mock_ for Windows.

BUG=none


Review URL: http://codereview.chromium.org/9008064

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@116345 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 6cb1586..06c92ef 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -63,7 +63,7 @@
   source_extensions = r'\.(cc|cpp|cxx|mm)$'
   file_inclusion_pattern = r'.+%s' % source_extensions
   file_exclusion_patterns = (
-      r'.*/(test_|mock_).+%s' % source_extensions,
+      r'.*[/\\](test_|mock_).+%s' % source_extensions,
       r'.+_test_(support|base)%s' % source_extensions,
       r'.+_(api|browser|perf|unit|ui)?test%s' % source_extensions,
       r'.+profile_sync_service_harness%s' % source_extensions,