Fix python scripts in src/tools/

tools/site_compare/scrapers/chrome/chromebase.py

Index: tools/site_compare/scrapers/chrome/chromebase.py
diff --git a/tools/site_compare/scrapers/chrome/chromebase.py b/tools/site_compare/scrapers/chrome/chromebase.py
old mode 100644
new mode 100755
index aba17c11decaba68468d036ffe653fe09f01cb15..2b8f1774cc44b424186672c25f6407dd88969256
--- a/tools/site_compare/scrapers/chrome/chromebase.py
+++ b/tools/site_compare/scrapers/chrome/chromebase.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.
 
@@ -12,10 +12,12 @@ from drivers import keyboard
 from drivers import mouse
 from drivers import windowing
 
+
 # TODO: this has moved, use some logic to find it. For now,
 # expects a subst k:.
 DEFAULT_PATH = r"k:\chrome.exe"
 
+
 def InvokeBrowser(path):
   """Invoke the Chrome browser.
 
@@ -179,7 +181,7 @@ def Time(urls, size, timeout, kwargs):
   return ret
 
 
-if __name__ == "__main__":
+def main():
   # We're being invoked rather than imported, so run some tests
   path = r"c:\sitecompare\scrapes\chrome\0.1.97.0"
   windowing.PreparePath(path)
@@ -190,4 +192,8 @@ if __name__ == "__main__":
     "http://www.google.com",
     "http://www.sun.com"],
          path, (1024, 768), (0, 0))
+  return 0
 
+
+if __name__ == "__main__":
+  sys.exit(main())