Remove ignored bot_update "force" parameter.

scripts/slave/recipe_modules/ios/api.py

 # Copyright 2015 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 copy
 
 from recipe_engine import recipe_api
 
 
 class iOSApi(recipe_api.RecipeApi):
@@ skipping 21 matching lines @@
     if step_result.json.output:
       step_result.presentation.step_text = '<br />OS X %s, Xcode %s (%s)' % (
         step_result.json.output['Mac OS X Version'],
         step_result.json.output['Xcode Version'],
         step_result.json.output['Xcode Build Version'],
       )
     return step_result
 
   def checkout(self, **kwargs):
     """Checks out Chromium."""
-    kwargs.setdefault('force', True)
     self.m.gclient.set_config('ios')
 
     checkout_dir = self.m.chromium_checkout.get_checkout_dir({})
     if checkout_dir:
       kwargs.setdefault('cwd', checkout_dir)
 
     return self.m.bot_update.ensure_checkout(**kwargs)
 
   @property
   def configuration(self):
@@ skipping 707 matching lines @@
   @property
   def most_recent_iossim(self):
     """Returns the path to the most recently compiled iossim."""
     platform = {
       'device': 'iphoneos',
       'simulator': 'iphonesimulator',
     }[self.platform]
 
     return self.m.path.join(
       'src', 'out', '%s-%s' % (self.configuration, platform), 'iossim')