Fix python scripts in src/tools/

tools/site_compare/site_compare.py

Index: tools/site_compare/site_compare.py
diff --git a/tools/site_compare/site_compare.py b/tools/site_compare/site_compare.py
old mode 100644
new mode 100755
index 15359fa05fc62aad1db290806445f0477616d309..db9216f2d0cdc7ccf66bc41707363841414efcda
--- a/tools/site_compare/site_compare.py
+++ b/tools/site_compare/site_compare.py
@@ -1,5 +1,5 @@
-#!/usr/bin/python2.4
-# Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+#!/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.
 
@@ -169,9 +169,8 @@ def main():
   commands.scrape.CreateCommand(cmdline)
 
   cmdline.ParseCommandLine()
-
+  return 0
 
 
 if __name__ == "__main__":
-  main()
-
+  sys.exit(main())