Remove ignored bot_update "force" parameter.

scripts/slave/recipes/boringssl.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.
 
 from recipe_engine.recipe_api import Property
 
 DEPS = [
   'chromium',
   'depot_tools/bot_update',
   'depot_tools/depot_tools',
@@ skipping 123 matching lines @@
 PROPERTIES = {
   'buildername': Property(),
 }
 
 
 def RunSteps(api, buildername):
   # Sync and pull in everything.
   api.gclient.set_config('boringssl')
   if _HasToken(buildername, 'android'):
     api.gclient.c.target_os.add('android')
-  api.bot_update.ensure_checkout(force=True)
+  api.bot_update.ensure_checkout()
   api.gclient.runhooks()
 
   # Set up paths.
   bot_utils = api.path['checkout'].join('util', 'bot')
   go_env = bot_utils.join('go', 'env.py')
   adb_path = bot_utils.join('android_tools', 'sdk', 'platform-tools', 'adb')
   build_dir = api.path['checkout'].join('build')
   runner_dir = api.path['checkout'].join('ssl', 'test', 'runner')
 
   # CMake is stateful, so do a clean build. BoringSSL builds quickly enough that
@@ skipping 129 matching lines @@
 
   yield (
     api.test('gerrit_cl') +
     api.platform('linux', 64) +
     api.properties.tryserver_gerrit(
         gerrit_host='boringssl-review.googlesource.com',
         full_project_name='boringssl',
         mastername='actually-no-master', buildername='linux',
         slavename='swarming-slave')
   )