Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/file/test_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.
 
 import os
 
-from slave import recipe_test_api
+from recipe_engine import recipe_test_api
 
 
 # We want to be able to really read a file during a recipe test. Of course,
 # we want to prevent recipe authors from reading files that only exist on
 # their own local disk (e.g. any file in some other repository), so that a
 # test only reads files that are guaranteed to be available wherever the test
 # is run (and by whomever runs it).
 # Therefore we only allow a real file to be read when it's in the same repo
 # as the recipe.
 # In order to enforce this, we accept a relative path and join it to the
@@ skipping 36 matching lines @@
     assert '..' not in os.sep.split(relpath), (
       'You can\'t use .. in read_in_build.'
     )
     with open(os.path.join(BUILD_INTERNAL, relpath)) as f:
       return f.read()
 
   def listdir(self, files):
     def listdir_callback():
       return self.m.json.output(files)
     return listdir_callback