Fix python scripts in src/tools/

tools/site_compare/command_line.py

Index: tools/site_compare/command_line.py
diff --git a/tools/site_compare/command_line.py b/tools/site_compare/command_line.py
old mode 100644
new mode 100755
index 2c87fb91dbbff26c15eebc7b96c5d328fd70c1de..de93d18ce0ab36525ecb1ae3af6e417ef5cf00d6
--- a/tools/site_compare/command_line.py
+++ b/tools/site_compare/command_line.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.
 
@@ -660,7 +660,8 @@ def DoHelpCommand(command):
 
     command.cmdline.Exit()
 
-if __name__ == "__main__":
+
+def main():
   # If we're invoked rather than imported, run some tests
   cmdline = CommandLine()
 
@@ -797,3 +798,5 @@ if __name__ == "__main__":
   cmdline.ParseCommandLine(["help", "test"])
 
 
+if __name__ == "__main__":
+  sys.exit(main())