Remove ignored bot_update "force" parameter.

scripts/slave/recipes/v8/auto_roll_v8_deps.py

 
 # Copyright 2014 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.types import freeze
 
 DEPS = [
   'depot_tools/bot_update',
   'depot_tools/gclient',
@@ skipping 79 matching lines @@
   s = api.gclient.c.solutions[1]
   s.custom_deps.update({
     'src/chrome/test/data/pdf_private': None,
     'src/native_client': None,
     'src/third_party/skia': None,
     'src/third_party/webrtc': None,
     'src/third_party/WebKit': None,
     'src/tools/valgrind': None,
     'src/v8': None,
   })
-  api.bot_update.ensure_checkout(force=True, no_shallow=True)
+  api.bot_update.ensure_checkout(no_shallow=True)
 
   # Enforce a clean state.
   api.git(
       'checkout', '-f', 'origin/master',
       cwd=api.path['checkout'],
   )
   api.git(
       'branch', '-D', 'roll',
       ok_ret='any',
       cwd=api.path['checkout'],
@@ skipping 112 matching lines @@
       ) +
       api.override_step_data(
           'look up another_dep',
           api.raw_io.stream_output('deadbeaf\tHEAD', stream='stdout'),
       ) +
       api.override_step_data(
           'git diff',
           api.raw_io.stream_output('some difference', stream='stdout'),
       )
   )