Remove ignored bot_update "force" parameter.

scripts/slave/recipes/v8/auto_roll_release_process.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.
 
 DEPS = [
   'depot_tools/bot_update',
   'file',
   'depot_tools/gclient',
   'depot_tools/git',
   'gsutil',
@@ skipping 126 matching lines @@
     step_result.presentation.status = api.step.FAILURE
     return True
   return False
 
 
 def RunSteps(api):
   repo = api.properties.get('repo', REPO)
   fail_on_exit = []
 
   api.gclient.set_config('v8')
-  api.bot_update.ensure_checkout(force=True, no_shallow=True)
+  api.bot_update.ensure_checkout(no_shallow=True)
 
   # Get current lkgr ref and update.
   new_lkgr = GetLKGR(api)
   current_lkgr = GetRef(api, repo, LKGR_REF)
   if new_lkgr != current_lkgr:
     PushRef(api, repo, LKGR_REF, new_lkgr)
   else:
     LogStep(api, 'There is no new lkgr.')
 
   # Get current candidate and update roll ref.
@@ skipping 110 matching lines @@
       date_new,
       current_roll=hsh_old,
   ) + api.override_step_data('check clusterfuzz', api.json.output([1, 2]))
   yield Test(
       'new_lkgr_failed_timestamp',
       hsh_recent,
       date_recent,
       hsh_new,
       date_new,
   ) + api.override_step_data('check timestamp', retcode=1)