Fix many (but not all[1]) depot_tools tests on Windows.

tests/presubmit_unittest.py

 #!/usr/bin/env python
 # 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.
 
 """Unit tests for presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint: disable=E1101,E1103
 
 import logging
@@ skipping 934 matching lines @@
                          'BUG=123',
                          ' STORY =http://foo/  \t',
                          'and some more regular text')
     files = [
       ['A', join('foo', 'blat.cc')],
       ['M', join('foo', 'blat', 'READ_ME2')],
       ['M', join('foo', 'blat', 'binary.dll')],
       ['M', join('foo', 'blat', 'weird.xyz')],
       ['M', join('foo', 'blat', 'another.h')],
       ['M', join('foo', 'third_party', 'third.cc')],
-      ['D', 'foo/mat/beingdeleted.txt'],
-      ['M', 'flop/notfound.txt'],
-      ['A', 'boo/flap.h'],
+      ['D', join('foo', 'mat', 'beingdeleted.txt')],
+      ['M', join('flop', 'notfound.txt')],
+      ['A', join('boo', 'flap.h')],
     ]
     blat = presubmit.normpath(join(self.fake_root_dir, files[0][1]))
     readme = presubmit.normpath(join(self.fake_root_dir, files[1][1]))
     binary = presubmit.normpath(join(self.fake_root_dir, files[2][1]))
     weird = presubmit.normpath(join(self.fake_root_dir, files[3][1]))
     another = presubmit.normpath(join(self.fake_root_dir, files[4][1]))
     third_party = presubmit.normpath(join(self.fake_root_dir, files[5][1]))
     beingdeleted = presubmit.normpath(join(self.fake_root_dir, files[6][1]))
     notfound = presubmit.normpath(join(self.fake_root_dir, files[7][1]))
     flap = presubmit.normpath(join(self.fake_root_dir, files[8][1]))
@@ skipping 1563 matching lines @@
         owners_check=False)
     self.assertEqual(1, len(results))
     self.assertEqual(
         'Found line ending with white spaces in:', results[0]._message)
     self.checkstdout('')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()