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

tests/gclient_scm_test.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 gclient_scm.py."""
 
 # pylint: disable=E1103
 
 # Import before super_mox to keep valid references.
@@ skipping 1046 matching lines @@
       self.jobs = 1
 
   def Options(self, *args, **kwargs):
     return self.OptionsObject(*args, **kwargs)
 
   def setUp(self):
     BaseTestCase.setUp(self)
     self.fake_hash_1 = 't0ta11yf4k3'
     self.fake_hash_2 = '3v3nf4k3r'
     self.url = 'git://foo'
-    self.root_dir = '/tmp'
+    self.root_dir = '/tmp' if sys.platform != 'win32' else 't:\\tmp'
     self.relpath = 'fake'
     self.base_path = os.path.join(self.root_dir, self.relpath)
 
   def tearDown(self):
     BaseTestCase.tearDown(self)
 
   def testGetUsableRevGit(self):
     # pylint: disable=E1101
     options = self.Options(verbose=True)
 
@@ skipping 111 matching lines @@
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     logging.basicConfig(
         level=logging.DEBUG,
         format='%(asctime).19s %(levelname)s %(filename)s:'
                '%(lineno)s %(message)s')
   unittest.main()
 
 # vim: ts=2:sw=2:tw=80:et: