build: Bot_update refactor recipe roll

scripts/slave/recipes/swarming/staging.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.
 
 """Swarming staging recipe: runs tests for HEAD of chromium using HEAD of
 swarming_client toolset on Swarming staging server instances
 (*-dev.appspot.com).
 
 Intended to catch bugs in swarming_client and Swarming servers early on, before
 full roll out.
@@ skipping 59 matching lines @@
   if api.properties.get('platform') == 'android':
     api.gclient.apply_config('android')
   api.gclient.c.solutions[0].custom_vars['swarming_revision'] = ''
   api.gclient.c.revisions['src/tools/swarming_client'] = 'HEAD'
 
   # Enable test isolation. Modifies GYP_DEFINES used in 'runhooks' below.
   api.isolate.set_isolate_environment(api.chromium.c)
 
   api.chromium.cleanup_temp()
   # Checkout chromium + deps (including 'master' of swarming_client).
-  step_result = api.bot_update.ensure_checkout()
-  if not step_result.json.output['did_run']:
-    api.gclient.checkout()
+  api.gclient.checkout()
 
   # Ensure swarming_client version is fresh enough.
   api.swarming.check_client_version()
 
   targets = ['chromium_swarm_tests']
   if api.properties.get('platform') == 'android':
     targets = [
         'android_webview_test_apk_run',
         'android_webview_unittests_apk_run',
         'base_unittests_apk_run',
@@ skipping 129 matching lines @@
     api.test('android') +
     api.platform.name('linux') +
     api.properties.scheduled() +
     api.properties(configuration='Release', platform='android') +
     api.override_step_data(
         'isolate tests',
         api.isolate.output_json(targets=[
             'dummy_target_1', 'dummy_target_2', 'chrome_public_test_apk'])
     )
   )