Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/chromium_android/chromium_config.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.
 
-from slave.recipe_config_types import Path
-from slave import recipe_config
+from recipe_engine.config_types import Path
+from recipe_engine import config as recipe_config
 
 import DEPS
 CONFIG_CTX = DEPS['chromium'].CONFIG_CTX
 
 @CONFIG_CTX(includes=['android_common', 'ninja', 'static_library'],
             config_vars={'TARGET_ARCH': 'arm', 'TARGET_BITS': 32,
                          'BUILD_CONFIG': 'Debug'})
 def base_config(c):
   c.compile_py.default_targets=[]
 
@@ skipping 151 matching lines @@
   gyp_defs['buildtype'] = 'Official'
 
 @CONFIG_CTX(includes=['main_builder'])
 def webview_perf(c):
   gyp_defs = c.gyp_env.GYP_DEFINES
   gyp_defs['android_webview_telemetry_build'] = 1
 
 @CONFIG_CTX(includes=['main_builder'])
 def cast_builder(c):
   c.gyp_env.GYP_DEFINES['chromecast'] = 1