Break config_default into master_site_configs.

masters/master.chromium/master_full_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
+import master_site_config
 
-ActiveMaster = config.Master.Chromium
+ActiveMaster = master_site_config.Chromium
 
 defaults = {}
 
 helper = master_config.Helper(defaults)
 B = helper.Builder
 D = helper.Dependent
 F = helper.Factory
 S = helper.Scheduler
 T = helper.Triggerable
 
@@ skipping 134 matching lines @@
       'gs_bucket': 'gs://chromium-browser-snapshots',
       'perf_id': 'android-release',
       'show_perf_results': True,
     },
     annotation_script='src/build/android/buildbot/bb_run_bot.py',
     ))
 
 
 def Update(_config, active_master, c):
   return helper.Update(c)