Remove ignored bot_update "force" parameter.

scripts/slave/recipes/catapult.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.
 
 DEPS = [
   'chromium',
   'depot_tools/bot_update',
   'depot_tools/gclient',
   'gitiles',
   'recipe_engine/generator_script',
   'recipe_engine/path',
   'recipe_engine/platform',
   'recipe_engine/properties',
   'recipe_engine/python',
 ]
 
 from recipe_engine.recipe_api import Property
 
 PROPERTIES = {
   'platform': Property(default=None, kind=str),
 }
 
 
 def _CheckoutSteps(api):
   """Checks out the catapult repo (and any dependencies) using gclient."""
   api.gclient.set_config('catapult')
-  api.bot_update.ensure_checkout(force=True)
+  api.bot_update.ensure_checkout()
   api.gclient.runhooks()
 
 
 def _FetchAppEngineSDKSteps(api):
   """Fetches the App Engine SDK and returns its path.
 
   This uses a downloader script in the infra repo to download a script
   which is then used to download and unpack the SDK itself.
   """
   script_content = api.gitiles.download_file(
@@ skipping 63 matching lines @@
                    slavename='android_slave',
                    platform='android') +
     api.step_data('Fetch SDK downloader',
                   api.gitiles.make_encoded_file(
                       '"<simulated contents of get_appengine.py>"')) +
     api.generator_script(
         'build_steps.py',
         {'name': 'Dashboard Tests', 'cmd': ['run_py_tests', '--no-hooks']},
     )
   )