Fix python scripts in src/chrome/

chrome/tools/extract_actions.py

Index: chrome/tools/extract_actions.py
diff --git a/chrome/tools/extract_actions.py b/chrome/tools/extract_actions.py
index 650f6e4cfbd3d88bdbde4472eed6c1e31a043627..09bab23dd1a0faafe0c00e7a4f4e4f1d4cd12c44 100755
--- a/chrome/tools/extract_actions.py
+++ b/chrome/tools/extract_actions.py
@@ -1,4 +1,4 @@
-#!/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.
@@ -439,6 +439,8 @@ def main(argv):
 
   if hash_output:
     print "Done. Do not forget to add chromeactions.txt to your changelist"
+  return 0
+
 
 if '__main__' == __name__:
-  main(sys.argv)
+  sys.exit(main(sys.argv))