Fix python scripts in src/tools/

tools/site_compare/drivers/win32/windowing.py

Index: tools/site_compare/drivers/win32/windowing.py
diff --git a/tools/site_compare/drivers/win32/windowing.py b/tools/site_compare/drivers/win32/windowing.py
old mode 100644
new mode 100755
index fe77c56928d402fcf01fb86fa220cf101e32382e..47d63f02272ab208ef4ec705c791ec33e3bf6805
--- a/tools/site_compare/drivers/win32/windowing.py
+++ b/tools/site_compare/drivers/win32/windowing.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.
 
@@ -338,7 +338,8 @@ def PreparePath(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
 
@@ -360,3 +361,6 @@ if __name__ == "__main__":
 
   EndProcess(proc, 0)
 
+
+if __name__ == "__main__":
+  sys.exit(main())