Fix python scripts in src/tools/

tools/site_compare/command_line.py

-#!/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.
 
 """Parse a command line, retrieving a command and its arguments.
 
 Supports the concept of command line commands, each with its own set
 of arguments. Supports dependent arguments and mutually exclusive arguments.
 Basically, a better optparse. I took heed of epg's WHINE() in gvn.cmdline
 and dumped optparse in favor of something better.
 """
@@ skipping 640 matching lines @@
 
     out.write(textwrap.fill(help_cmd.helptext, width))
     out.write("\n\n")
     out.write(help_cmd.GetUsageString(width=width))
     out.write("\n\n")
     out.write(help_cmd.GetHelpString(width=width))
     out.write("\n")
 
     command.cmdline.Exit()
 
-if __name__ == "__main__":
+
+def main():
   # If we're invoked rather than imported, run some tests
   cmdline = CommandLine()
 
   # Since we're testing, override Exit()
   def TestExit():
     pass
   cmdline.Exit = TestExit
 
   # Actually, while we're at it, let's override error output too
   cmdline.err = open(os.path.devnull, "w")
@@ skipping 116 matching lines @@
     if not len(cmdline.command.parse_errors) == expected_failures:
       print "FAILED:\n  issued: '%s'\n  expected: %d\n  received: %d\n\n" % (
         test, expected_failures, len(cmdline.command.parse_errors))
       badtests += 1
 
   print "%d failed out of %d tests" % (badtests, len(test_lines))
 
   cmdline.ParseCommandLine(["help", "test"])
 
 
+if __name__ == "__main__":
+  sys.exit(main())