Add DBUS_SESSION_BUS_ADDRESS to allowed slave env vars.

slave/run_slave.py

 #!/usr/bin/env python
 # 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.
 
 """ Initialize the environment variables and start the buildbot slave.
 """
 
 import os
 import shutil
@@ skipping 337 matching lines @@
 
   if sys.platform.startswith('win'):
     # list of all variables that we want to keep
     env_var = [
         'APPDATA',
         'BUILDBOT_ARCHIVE_FORCE_SSH',
         'CHROME_HEADLESS',
         'CHROMIUM_BUILD',
         'COMSPEC',
         'COMPUTERNAME',
+        'DBUS_SESSION_BUS_ADDRESS',
         'DXSDK_DIR',
         'HOMEDRIVE',
         'HOMEPATH',
         'LOCALAPPDATA',
         'NUMBER_OF_PROCESSORS',
         'OS',
         'PATH',
         'PATHEXT',
         'PROCESSOR_ARCHITECTURE',
         'PROCESSOR_ARCHITEW6432',
@@ skipping 115 matching lines @@
   if skip_sync_arg not in sys.argv:
     UseBotoPath()
     if subprocess.call([GetGClientPath(), 'sync', '--force']) != 0:
       print >> sys.stderr, (
           '(%s) `gclient sync` failed; proceeding anyway...' % sys.argv[0])
     os.execv(sys.executable, [sys.executable] + sys.argv + [skip_sync_arg])
 
   # Remove skip_sync_arg from arg list.  Needed because twistd.
   sys.argv.remove(skip_sync_arg)
   main()