Fix harmless warning in setup_third_party

webkit/support/setup_third_party.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 """A helper script for setting up forwarding headers."""
 
 import errno
 import os
 import sys
 
 
 def GetHeaderFilesInDir(dir_path):
   """Return a list of all header files in dir_path."""
   all_files = []
   for root, dirs, files in os.walk(dir_path):
-    all_files.extend([os.path.join(root, f) for f in files if f.endswith('.h')])
+    all_files.extend([os.path.join(root, f).replace(os.sep, '/')
+                      for f in files if f.endswith('.h')])
   return all_files
 
 
 def Inputs(args):
   """List the files in the provided input dir.
 
   args: A list with 1 value, the input dir.
   Returns: 0 on success, other value on error."""
   if len(args) != 1:
     print "'inputs' expects only one input directory."
@@ skipping 91 matching lines @@
     'outputs': Outputs,
     'setup_headers': SetupHeaders,
   }
   command = argv[1]
   args = argv[2:]
   return commands[command](args)
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))