Improve the testing situation on Windows....

PRESUBMIT.py

 # Copyright (c) 2009 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 depot tools.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
 details on the presubmit API built into gcl.
 """
 
@@ skipping 38 matching lines @@
           'git-cl-upload-hook')]
   return []
 
 def RunPylint(input_api, output_api):
   import glob
   files = glob.glob('*.py')
   # It's a python script
   files.append('git-try')
   # It uses non-standard pylint exceptions that makes pylint always fail.
   files.remove('cpplint.py')
-  proc = input_api.subprocess.Popen(['pylint', '-E'] + files)
+  try:
+    proc = input_api.subprocess.Popen(['pylint', '-E'] + files)
+  except WindowsError:
+    # It's windows, give up.
+    return []
   proc.communicate()
   if proc.returncode:
     return [output_api.PresubmitError('Fix pylint errors first.')]
   return []