Fix running 'import run_isolated' at python interactive prompt.

utils/zip_package.py

 # Copyright 2013 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.
 
 """Utilities to work with importable python zip packages."""
 
 import atexit
 import collections
 import cStringIO as StringIO
 import os
@@ skipping 219 matching lines @@
 def get_main_script_path():
   """If running from zip returns path to a zip file, else path to __main__.
 
   Basically returns path to a file passed to python for execution
   as in 'python <main_script>' considering a case of executable zip package.
 
   Returns path relative to a current directory of when process was started.
   """
   # If running from interactive console __file__ is not defined.
   main = sys.modules['__main__']
-  return get_module_zip_archive(main) or getattr(main, '__file__')
+  return get_module_zip_archive(main) or getattr(main, '__file__', None)
 
 
 def extract_resource(package, resource):
   """Returns real file system path to a |resource| file from a |package|.
 
   If it's inside a zip package, will extract it first into temp file created
   with tempfile.mkstemp. Such file is readable and writable only by the creating
   user ID.
 
   |package| is a python module object that represents a package.
@@ skipping 32 matching lines @@
   """Removes all temporary files created by extract_resource.
 
   Executed as atexit hook.
   """
   with _extracted_files_lock:
     while _extracted_files:
       try:
         os.remove(_extracted_files.pop())
       except OSError:
         pass