Remove ignored bot_update "force" parameter.

scripts/slave/recipes/win_analyze.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 = [
   'depot_tools/bot_update',
   'chromium',
 ]
 
 
 BUILDERS = {
   'chromium.fyi': {
     'builders': {
       'Chromium Windows Analyze': {
         'chromium_config_kwargs': {
           'BUILD_CONFIG': 'Debug',
           'TARGET_PLATFORM': 'win',
           'TARGET_BITS': 32,
         },
         'chromium_apply_config': ['clobber'],
       },
     },
   },
 }
 
 
 def RunSteps(api):
   api.chromium.configure_bot(BUILDERS, ['win_analyze', 'mb'])
 
-  api.bot_update.ensure_checkout(force=True)
+  api.bot_update.ensure_checkout()
 
   api.chromium.runhooks()
 
   # This is needed to disable building with goma
   api.chromium.c.compile_py.compiler = None
   api.chromium.c.compile_py.goma_dir = None
 
   api.chromium.run_mb('chromium.fyi', 'Chromium Windows Analyze',
                       use_goma=False)
 
   api.chromium.compile(targets=['chrome'])
 
 
 def GenTests(api):
   for test in api.chromium.gen_tests_for_builders(BUILDERS):
     yield test