Fix python scripts in src/chrome/

chrome/test/pyautolib/chromeos/suid_actions.py

-#!/usr/bin/python
-
+#!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Helper script to perform actions as a super-user on ChromeOS.
 
 Needs to be run with superuser privileges, typically using the
 suid_python binary.
 
 Usage:
   sudo python suid_actions.py --action=clean_flimflam
 """
 
 import optparse
 import os
 import shutil
+import sys
 
 
 class SuidAction(object):
   """Helper to perform some super-user actions on ChromeOS."""
 
   def _ParseArgs(self):
     parser = optparse.OptionParser()
     parser.add_option(
         '-a', '--action', help='Action to perform.')
     self._options = parser.parse_args()[0]
     if not self._options.action:
       raise RuntimeError('No action specified.')
 
-
   def Run(self):
     self._ParseArgs()
     assert os.geteuid() == 0, 'Needs superuser privileges.'
     handler = getattr(self, self._options.action)
     assert handler and callable(handler), \
         'No handler for %s' % self._options.action
     handler()
+    return 0
 
   ## Actions ##
 
   def CleanFlimflamDir(self):
     """Clean the contents of /home/chronos/user/flimflam."""
     flimflam_dir = '/home/chronos/user/flimflam'
     if not os.path.exists(flimflam_dir):
       return
     for item in os.listdir(flimflam_dir):
       path = os.path.join(flimflam_dir, item)
       if os.path.isdir(path):
         shutil.rmtree(path)
       else:
         os.remove(path)
 
 
 if __name__ == '__main__':
-  suid_action = SuidAction()
-  suid_action.Run()
+  sys.exit(SuidAction().Run())