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

PRESUBMIT.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 45 matching lines @@
   non-testing code. For now this is just a best-effort implementation
   that ignores header files and may have some false positives. A
   better implementation would probably need a proper C++ parser.
   """
   # We only scan .cc files and the like, as the declaration of
   # for-testing functions in header files are hard to distinguish from
   # calls to such functions without a proper C++ parser.
   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,
       )
   path_exclusion_patterns = (
       r'.*[/\\](test|tool(s)?)[/\\].*',
       # At request of folks maintaining this folder.
       r'chrome[/\\]browser[/\\]automation[/\\].*',
       )
 
@@ skipping 259 matching lines @@
 def GetPreferredTrySlaves(project, change):
   only_objc_files = all(
       f.LocalPath().endswith(('.mm', '.m')) for f in change.AffectedFiles())
   if only_objc_files:
     return ['mac_rel']
   preferred = ['win_rel', 'linux_rel', 'mac_rel']
   aura_re = '_aura[^/]*[.][^/]*'
   if any(re.search(aura_re, f.LocalPath()) for f in change.AffectedFiles()):
     preferred.append('linux_chromeos_aura:compile')
   return preferred