Don't issue presubmit warning for use of wstrings in Windows-only files.

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 291 matching lines @@
     return []
   return [output_api.PresubmitPromptWarning('UNIT_TEST is only for headers.\n' +
       '\n'.join(problems))]
 
 
 def _CheckNoNewWStrings(input_api, output_api):
   """Checks to make sure we don't introduce use of wstrings."""
   problems = []
   for f in input_api.AffectedFiles():
     if (not f.LocalPath().endswith(('.cc', '.h')) or
-        f.LocalPath().endswith('test.cc')):
+        f.LocalPath().endswith(('test.cc', '_win.cc', '_win.h'))):
       continue
 
     allowWString = False
     for line_num, line in f.ChangedContents():
       if 'presubmit: allow wstring' in line:
         allowWString = True
       elif not allowWString and 'wstring' in line:
         problems.append('    %s:%d' % (f.LocalPath(), line_num))
         allowWString = False
       else:
@@ skipping 731 matching lines @@
     trybots += ['linux_chromeos_clang:compile', 'linux_chromeos_asan']
 
   # The AOSP bot doesn't build the chrome/ layer, so ignore any changes to it
   # unless they're .gyp(i) files as changes to those files can break the gyp
   # step on that bot.
   if (not all(re.search('^chrome', f) for f in files) or
       any(re.search('\.gypi?$', f) for f in files)):
     trybots += ['android_aosp']
 
   return trybots