Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/syzygy/config.py

 # Copyright 2014 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 types
 
-from slave.recipe_config import config_item_context, ConfigGroup, Single
-from slave.recipe_config_types import Path
+from recipe_engine.config import config_item_context, ConfigGroup, Single
+from recipe_engine.config_types import Path
 from . import api as syzygy_api
 
 
 def BaseConfig(**dummy_kwargs):
   return ConfigGroup(
     official_build = Single(bool, empty_val=False, required=False),
     unittests_gypi = Single(Path, required=False),
     version_file = Single(Path, required=False),
   )
 
@@ skipping 18 matching lines @@
   c.official_build = True
   c.unittests_gypi = Path('[CHECKOUT]', 'syzygy', 'unittests.gypi')
   c.version_file = Path('[CHECKOUT]', 'syzygy', 'SYZYGY_VERSION')
 
 
 @config_ctx()
 def kasko_official(c):
   c.official_build = True
   c.unittests_gypi = Path('[CHECKOUT]', 'syzygy', 'kasko', 'unittests.gypi')
   c.version_file = Path('[CHECKOUT]', 'syzygy', 'kasko', 'VERSION')