Remove slave versions from config_default.py.

site_config/config_default.py

 # Copyright (c) 2012 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.
 
 """Seeds a number of variables defined in chromium_config.py.
 
 The recommended way is to fork this file and use a custom DEPS forked from
 config/XXX/DEPS with the right configuration data."""
 
 
@@ skipping 56 matching lines @@
     tree_closing_notification_recipients = []
     # 'from:' field for emails sent from the server.
     from_address = 'nobody@example.com'
     # Code review site to upload results. You should setup your own Rietveld
     # instance with the code at
     # http://code.google.com/p/rietveld/source/browse/#svn/branches/chromium
     # You can host your own private rietveld instance on Django, see
     # http://code.google.com/p/google-app-engine-django and
     # http://code.google.com/appengine/articles/pure_django.html
     code_review_site = 'https://chromiumcodereview.appspot.com/status_listener'
-    # Versions of third_party twisted and buildbot libraries to run on slaves.
-    buildslave_version = 'buildbot_slave_8_4'
-    twisted_version = 'twisted_10_2'
 
     # For the following values, they are used only if non-0. Do not set them
     # here, set them in the actual master configuration class.
 
     # Used for the waterfall URL and the waterfall's WebStatus object.
     master_port = 0
     # Which port slaves use to connect to the master.
     slave_port = 0
     # The alternate read-only page. Optional.
     master_port_alt = 0
@@ skipping 380 matching lines @@
   # Web server base path.
   www_dir_base = "\\\\" + archive_host + "\\www\\"
 
   @staticmethod
   def Internal():
     pass
 
 
 class Distributed(object):
   """Not much to describe."""