Fix python scripts in src/tools/

tools/site_compare/drivers/win32/keyboard.py

Index: tools/site_compare/drivers/win32/keyboard.py
diff --git a/tools/site_compare/drivers/win32/keyboard.py b/tools/site_compare/drivers/win32/keyboard.py
old mode 100644
new mode 100755
index 246e14c2cca84c830d67ff8b76d5eacc11b8448a..2950ac0b7a875a0f1185f3148effbf5d9d7f4624
--- a/tools/site_compare/drivers/win32/keyboard.py
+++ b/tools/site_compare/drivers/win32/keyboard.py
@@ -1,4 +1,4 @@
-#!/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.
@@ -166,7 +166,8 @@ def TypeString(string_to_type,
   if ctrl_held:  PressKey(False, win32con.VK_CONTROL)
   if alt_held:   PressKey(False, win32con.VK_MENU)
 
-if __name__ == "__main__":
+
+def main():
   # We're being invoked rather than imported. Let's do some tests
 
   # Press command-R to bring up the Run dialog
@@ -196,3 +197,5 @@ if __name__ == "__main__":
              time_between_keystrokes=0.05)
 
 
+if __name__ == "__main__":
+  sys.exit(main())