CrOS: Use local Chromite checkout for configs.

scripts/slave/recipe_modules/chromite/config.py

 # Copyright 2013 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.
 
 import os
 import types
 
-from common import cros_chromite
 from recipe_engine.config import config_item_context, ConfigGroup
 from recipe_engine.config import Dict, Single, Set
 
 import DEPS
 path_api = DEPS['path'].api
 
 
 def BaseConfig(CBB_CONFIG=None, CBB_BRANCH=None, CBB_BUILD_NUMBER=None,
                CBB_DEBUG=False, CBB_CLOBBER=False, **_kwargs):
   return ConfigGroup(
@@ skipping 114 matching lines @@
 
 @config_ctx(group='master', includes=['external'])
 def chromiumos_tryserver(c):
   c.cbb.disable_bootstrap = True
 
 @config_ctx()
 def chromiumos_coverage_test(c):
   c.use_chrome_version = True
   c.read_cros_manifest = True
   c.cbb.chrome_rev = 'stable'