Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/bot_update/api.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.
 
 
 """Recipe module to ensure a checkout is consistant on a bot."""
 
-from slave import recipe_api
-from slave import recipe_util
+from recipe_engine import recipe_api
 
 
 # This is just for testing, to indicate if a master is using a Git scheduler
 # or not.
 SVN_MASTERS = (
     'experimental.svn',
 )
 
 
 def jsonish_to_python(spec, is_top=False):
@@ skipping 210 matching lines @@
 
       # bot_update actually just sets root to be the folder name of the
       # first solution.
       if step_result.json.output['did_run']:
         co_root = step_result.json.output['root']
         cwd = kwargs.get('cwd', self.m.path['slave_build'])
         if 'checkout' not in self.m.path:
           self.m.path['checkout'] = cwd.join(*co_root.split(self.m.path.sep))
 
     return step_result