Revert of RELAND of Cross-repo recipe package system.

scripts/slave/unittests/recipe_simulation_test.py

 #!/usr/bin/env python
 # Copyright (c) 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 os
-import shutil
 import sys
 
 import test_env  # pylint: disable=W0403,W0611
 
-# Delete the old recipe_engine directory which might have stale pyc files
-# that will mess us up.
-shutil.rmtree(os.path.join(
-        os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(
-            os.path.realpath(__file__))))),
-        'third_party', 'recipe_engine'),
-    ignore_errors=True)
+from recipe_engine import simulation_test
+from slave import recipe_universe
 
-RECIPES_PY = os.path.join(
-    os.path.dirname(os.path.dirname(os.path.realpath(__file__))),
-    'recipes.py')
-
-args = [sys.argv[0], 'simulation_test'] + sys.argv[1:]
-os.execvp(RECIPES_PY, args)
+if __name__ == '__main__':
+  simulation_test.main(recipe_universe.get_universe())