Don't require a .dbconfig file on any masters.

masters/master.chromium.chromedriver/master.cfg

 # 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.
 
 from buildbot.scheduler import Scheduler
 from buildbot.scheduler import Triggerable
 
 from common import chromium_utils
 
 from master import gitiles_poller
 from master import master_config
 from master import master_utils
 from master import slaves_list
 from master.factory import annotator_factory
 from buildbot import locks
 
 import config
 import master_site_config
 
 ActiveMaster = master_site_config.ChromiumChromeDriver
 
 # This is the dictionary that the buildmaster pays attention to. We also use
 # a shorter alias to save typing.
 c = BuildmasterConfig = {}
 
 # Disable compression for the stdio files.
 c['logCompressionLimit'] = False
 
-config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
+config.DatabaseSetup(c)
 
 ####### CHANGESOURCES
 
 master_poller = gitiles_poller.GitilesPoller(
     'https://chromium.googlesource.com/chromium/src')
 
 c['change_source'] = [master_poller]
 
 
 ####### SCHEDULERS
@@ skipping 75 matching lines @@
 # Buildbot master url:
 # Must come before AutoSetupMaster().
 c['buildbotURL'] = ActiveMaster.buildbot_url
 
 # Adds common status and tools to this master.
 master_utils.AutoSetupMaster(c, ActiveMaster,
     public_html='../master.chromium/public_html',
     templates=['../master.chromium/templates'],
     tagComparator=master_poller.comparator,
     enable_http_status_push=ActiveMaster.is_production_host)