Fix python scripts in src/chrome/

chrome/app/policy/syntax_check_policy_template_json.py

-#!/usr/bin/python2
+#!/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.
 
 '''
 Checks a policy_templates.json file for conformity to its syntax specification.
 '''
 
 import json
 import optparse
@@ skipping 394 matching lines @@
     (options, args) = parser.parse_args(argv)
     if filename is None:
       if len(args) != 2:
         parser.print_help()
         sys.exit(1)
       filename = args[1]
     return self.Main(filename, options)
 
 
 if __name__ == '__main__':
-  checker = PolicyTemplateChecker()
-  sys.exit(checker.Run(sys.argv))
+  sys.exit(PolicyTemplateChecker().Run(sys.argv))