Break config_default into master_site_configs.

masters/master.chromium.webkit/master_mac_webkit_pinned_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.
 
 # WebKit test builders using the Skia graphics library.
 
 from master import master_config
 from master.factory import chromium_factory
 
-import config
+import master_site_config
 
-ActiveMaster = config.Master.ChromiumWebkit
+ActiveMaster = master_site_config.ChromiumWebkit
 
 defaults = {}
 
 helper = master_config.Helper(defaults)
 B = helper.Builder
 D = helper.Dependent
 F = helper.Factory
 S = helper.Scheduler
 
 def mac(): return chromium_factory.ChromiumFactory('src/xcodebuild', 'darwin')
@@ skipping 60 matching lines @@
       'layout_test_platform': 'chromium-mac',
       'test_results_server': 'test-results.appspot.com',
     }))
 
 ################################################################################
 ##
 ################################################################################
 
 def Update(_config, active_master, c):
   return helper.Update(c)