Fix python scripts in src/tools/

tools/site_compare/drivers/win32/windowing.py

-#!/usr/bin/python2.4
+#!/usr/bin/env python
 # Copyright (c) 2006-2008 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.
 
 """SiteCompare module for invoking, locating, and manipulating windows.
 
 This module is a catch-all wrapper for operating system UI functionality
 that doesn't belong in other modules. It contains functions for finding
 particular windows, scraping their contents, and invoking processes to
 create them.
@@ skipping 319 matching lines @@
     path: fully-qualified path of directory to ensure exists
 
   Returns:
     None
   """
   try:
     os.makedirs(path)
   except OSError, e:
     if e[0] != 17: raise e   # error 17: path already exists
 
-if __name__ == "__main__":
+
+def main():
   PreparePath(r"c:\sitecompare\scrapes\ie7")
   # We're being invoked rather than imported. Let's do some tests
 
   # Hardcode IE's location for the purpose of this test
   (proc, wnd) = InvokeAndWait(
     r"c:\program files\internet explorer\iexplore.exe")
 
   # Find the browser pane in the IE window
   browser = FindChildWindow(
     wnd, "TabWindowClass/Shell DocObject View/Internet Explorer_Server")
 
   # Move and size the window
   MoveAndSizeWindow(wnd, (0, 0), (1024, 768), browser)
 
   # Take a screenshot
   i = ScrapeWindow(browser)
 
   i.show()
 
   EndProcess(proc, 0)
 
+
+if __name__ == "__main__":
+  sys.exit(main())