use additional_expectations as a command parameter

masters/master.chromium.webkit/master_linux_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 @@
         'webkit',
     ],
     options=[
         '--build-tool=ninja',
         '--compiler=goma',
         '--',
         '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' },
         'test_results_server': 'test-results.appspot.com',
     }))
 
 
 def Update(_config, active_master, c):
   return helper.Update(c)