use additional_expectations as a command parameter

masters/master.chromium.webkit/master_win_contentshell_latest_cfg.py

 # 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.
 
 
 from master import master_config
 from master.factory import chromium_factory
 
 import config
 
@@ skipping 29 matching lines @@
 
 F('f_contentshell_win_rel', win().ChromiumWebkitLatestFactory(
     target='Release',
     slave_type='BuilderTester',
     tests=[
       'webkit',
     ],
     project='all.sln;content_shell_builder',
     factory_properties={
       'additional_drt_flag': '--dump-render-tree',
-      'additional_expectations_files': [
+      'additional_expectations': [
           [ 'third_party',
             'WebKit',
             'LayoutTests',
             'platform',
             'chromium',
             'ContentShellTestExpectations' ],
       ],
       'archive_webkit_results': ActiveMaster.is_production_host,
       'driver_name': 'content_shell',
       'gclient_env': {'GYP_DEFINES': 'fastbuild=1'},
       'test_results_server': 'test-results.appspot.com',
     }))
 
 
 def Update(_config, active_master, c):
   return helper.Update(c)