Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/json/api.py

Index: scripts/slave/recipe_modules/json/api.py
diff --git a/scripts/slave/recipe_modules/json/api.py b/scripts/slave/recipe_modules/json/api.py
index 2b8fc6dc1aea4914031845e2ed2bd805450e02fc..c41bd42e17fb9f05b8fcca8792acb2d9c9b73bd6 100644
--- a/scripts/slave/recipe_modules/json/api.py
+++ b/scripts/slave/recipe_modules/json/api.py
@@ -7,9 +7,9 @@ import collections
 import contextlib
 import json
 
-from slave import recipe_api
-from slave import recipe_util
-from slave import recipe_config_types
+from recipe_engine import recipe_api
+from recipe_engine import util as recipe_util
+from recipe_engine import config_types
 
 
 class JsonOutputPlaceholder(recipe_util.Placeholder):
@@ -68,7 +68,7 @@ class JsonApi(recipe_api.RecipeApi):
     @functools.wraps(json.dumps)
     def dumps(*args, **kwargs):
       kwargs['sort_keys'] = True
-      kwargs.setdefault('default', recipe_config_types.json_fixup)
+      kwargs.setdefault('default', config_types.json_fixup)
       return json.dumps(*args, **kwargs)
     self.dumps = dumps