use additional_expectations as a command parameter

masters/master.chromium.webkit/master_mac_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 33 matching lines @@
     tests=[
       'webkit',
     ],
     options=[
       '--build-tool=ninja',
       '--compiler=goma-clang',
       '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_GENERATORS':'ninja',
           'GYP_DEFINES':'fastbuild=1',
       },
       'test_results_server': 'test-results.appspot.com',
     }))
 
 
 def Update(_config, active_master, c):
   return helper.Update(c)