Make blink_trybot recipe work on windows

scripts/slave/recipe_modules/gclient/config.py

 # Copyright 2013 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 types
 
 from slave.recipe_configs_util import config_item_context, ConfigGroup, BadConf
 from slave.recipe_configs_util import DictConfig, SimpleConfig, StaticConfig
 from slave.recipe_configs_util import SetConfig, ConfigList, ListConfig
 
-def BaseConfig(USE_MIRROR=True, GIT_MODE=False):
+def BaseConfig(USE_MIRROR=True, GIT_MODE=False, **_kwargs):
   deps = '.DEPS.git' if GIT_MODE else 'DEPS'
   return ConfigGroup(
     solutions = ConfigList(
       lambda: ConfigGroup(
         name = SimpleConfig(str),
         url = SimpleConfig(str),
         deps_file = SimpleConfig(str, empty_val=deps, required=False),
         managed = SimpleConfig(bool, empty_val=True, required=False),
         custom_deps = DictConfig(value_type=(str, types.NoneType)),
         custom_vars = DictConfig(value_type=str),
@@ skipping 96 matching lines @@
 
 @config_ctx()
 def tools_build(c):
   if not c.GIT_MODE:
     raise BadConf('tools_build only supports git')
   s = c.solutions.add()
   s.name = 'build'
   s.url = ChromiumGitURL(c, 'chromium', 'tools', 'build.git')