Remove ignored bot_update "force" parameter.

scripts/slave/recipe_modules/chromite/api.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.
 
 import cgi
 import re
 
 from recipe_engine import recipe_api
 
 
@@ skipping 253 matching lines @@
 
   def run_cbuildbot(self, args=[]):
     self.checkout_chromite()
     self.run(args=args)
 
   def checkout_chromite(self):
     """Checks out the configured Chromite branch.
     """
     self.m.bot_update.ensure_checkout(
         gclient_config=self.gclient_config(),
-        update_presentation=False,
-        force=True)
+        update_presentation=False)
 
     if self.c.chromite_branch and self.c.cbb.disable_bootstrap:
       # Chromite auto-detects which branch to build for based on its current
       # checkout. "bot_update" checks out remote branches, but Chromite requires
       # a local branch.
       #
       # Normally we'd bootstrap, but if we're disabling bootstrapping, we have
       # to checkout the local branch to let Chromite know which branch to build.
       self.m.git('checkout', self.c.chromite_branch,
           name=str('checkout chromite branch [%s]' % (self.c.chromite_branch)))
@@ skipping 77 matching lines @@
       cbb_args.extend(['--master-build-id', self.c.cbb.build_id])
 
     # Add custom args, if there are any.
     cbb_args.extend(args)
 
     # Run cbuildbot.
     return self.cbuildbot(str('cbuildbot [%s]' % (self.c.cbb.config,)),
                           self.c.cbb.config,
                           args=cbb_args,
                           cwd=self.m.path['slave_build'])