Fix gclient runhooks on Windows for a full checkout.

tools/get_drt.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Gets or updates a DumpRenderTree (a nearly headless build of chrome). This is
 # used for running browser tests of client applications.
 
 import os
@@ skipping 84 matching lines @@
 
 def main():
   system = platform.system()
   if system == 'Darwin':
     osname = 'mac'
   elif system == 'Linux':
     osname = 'lucid64'
   else:
     print >>sys.stderr, ('WARNING: platform "%s" does not support'
         'DumpRenderTree for tests') % system
-    return 1
+    return 0
 
   ensure_config()
 
   # Query for the lastest version
   pattern = DRT_DARTIUM_LATEST_PATTERN  % { 'osname' : osname }
   result, out = gsutil('ls', pattern)
   if result == 0:
     latest = out.split()[-1]
     # use permanent link instead, just in case the latest zip entry gets deleted
     # while we are downloading it.
@@ skipping 41 matching lines @@
   # create the version stamp
   v = open(VERSION, 'w')
   v.write(latest)
   v.close()
 
   print 'Successfully downloaded to %s' % DRT_DIR
   return 0
 
 if __name__ == '__main__':
   sys.exit(main())