Remove ignored bot_update "force" parameter.

scripts/slave/recipe_modules/syzygy/api.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.
 
 import ast
 import os
 import re
 
 from recipe_engine import recipe_api
 
@@ skipping 143 matching lines @@
 
     This invokes a dummy step on the test slave as killing all instances of
     Chrome seriously impairs development.
     """
     if self.m.properties['slavename'] == 'fake_slave':
       return self.m.python.inline('taskkill', 'print "dummy taskkill"')
     return self.m.chromium.taskkill()
 
   def checkout(self):
     """Checks out the Syzygy code using the current gclient configuration."""
-    step = self.m.bot_update.ensure_checkout(force=True)
+    step = self.m.bot_update.ensure_checkout()
     self._revision = step.presentation.properties['got_revision']
     github_url = self._SYZYGY_GITHUB + str(self._revision)
     step.presentation.links[str(self._revision)] = github_url
     return step
 
   def runhooks(self):
     return self.m.chromium.runhooks()
 
   def compile(self):
     """Generates a step to compile the project."""
@@ skipping 147 matching lines @@
             '--overwrite',
             '--verbose']
     return self.m.python('download_binaries', get_syzygy_binaries_py, args)
 
   def smoke_test(self):
     """Returns a step that launches the smoke test script."""
     smoke_test_py = self.internal_scripts_dir.join('smoke_test.py')
     build_dir = self.m.path['checkout'].join('build')
     args = ['--verbose', '--build-dir', build_dir]
     return self.m.python('smoke_test', smoke_test_py, args)