Change models.py to use typed class members instead of a list of strings.

tests/pending_manager_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Unit tests for pending_manager.py."""
 
 import logging
 import os
 import re
@@ skipping 49 matching lines @@
     super(TestPendingManager, self).setUp()
     self.root_dir = ROOT_DIR
 
   def testLoadSave(self):
     pc = pending_manager.PendingManager(
         context.Context(None, None, mocks.AsyncPushMock(self)),
         [fake.FakeVerifier(base.SUCCEEDED)],
         [])
     filename = os.path.join(self.root_dir, 'foo.json')
     empty = """{
-  "__persistent_module__": "pending_manager",
   "__persistent_type__": "PendingQueue",
   "pending_commits": []
 }
 """
     write(filename, empty)
     try:
       pc.load(filename)
       self.assertEquals(pc.queue.pending_commits, [])
       pc.save(filename)
       self.assertEquals(trim(empty), trim(read(filename)))
@@ skipping 545 matching lines @@
           "commit(u'foo\\n\\nReview URL: http://nowhere/31337', "
               "'author@example.com')"])
 
 
 if __name__ == '__main__':
   logging.basicConfig(
       level=[logging.ERROR, logging.WARNING, logging.INFO, logging.DEBUG][
         min(sys.argv.count('-v'), 3)],
       format='%(levelname)5s %(module)15s(%(lineno)3d): %(message)s')
   unittest.main()