Remove ignored bot_update "force" parameter.

scripts/slave/recipes/swarming/deterministic_build.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.
 
 """Recipe to test the deterministic build.
 
 Waterfall page: https://build.chromium.org/p/chromium.swarm/waterfall
 
 """
 
@@ skipping 69 matching lines @@
   api.chromium.set_config(recipe_config['chromium_config'],
                           **recipe_config.get('chromium_config_kwargs',
                                               {'BUILD_CONFIG': 'Release'}))
   api.chromium.apply_config('clobber')
   api.gclient.set_config(recipe_config['gclient_config'],
                          **recipe_config.get('gclient_config_kwargs', {}))
 
   api.chromium.cleanup_temp()
 
   # Checkout chromium.
-  api.bot_update.ensure_checkout(force=True)
+  api.bot_update.ensure_checkout()
 
 
 def ConfigureAndroidBuilder(api, recipe_config):
   kwargs = {
     'REPO_NAME': 'src',
     'REPO_URL': 'https://chromium.googlesource.com/chromium/src.git',
     'Internal': False,
   }
   kwargs.update(recipe_config.get('chromium_config_kwargs',
                                   {'BUILD_CONFIG': 'Release'}))
@@ skipping 78 matching lines @@
                                 _sanitize_nonalpha(buildername))
     yield (
       api.test(test_name) +
       api.properties.scheduled() +
       api.properties.generic(buildername=buildername,
                              mastername=mastername) +
       api.platform(DETERMINISTIC_BUILDERS[buildername]['platform'], 32) +
       api.properties(configuration='Release') +
       api.step_data('remove_build_metadata', retcode=1)
     )