Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/chromite/api.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 cgi
 import re
 
-from slave import recipe_api
+from recipe_engine import recipe_api
 
 
 class ChromiteApi(recipe_api.RecipeApi):
   chromite_url = 'https://chromium.googlesource.com/chromiumos/chromite.git'
   manifest_url = 'https://chromium.googlesource.com/chromiumos/manifest.git'
   repo_url = 'https://chromium.googlesource.com/external/repo.git'
   chromite_subpath = 'chromite'
 
   # The number of Gitiles attempts to make before giving up.
   _GITILES_ATTEMPTS = 10
@@ skipping 301 matching lines @@
         gclient_config=self.gclient_config(),
         update_presentation=False,
         force=True)
 
     # Run cbuildbot.
     return self.cbuildbot(str('cbuildbot [%s]' % (config,)),
                           config,
                           args=cbb_args,
                           chromite_path=self.m.path['checkout'],
                           cwd=self.m.path['slave_root'])