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

masters/master.tryserver.v8/master.cfg

 #!/usr/bin/env python
 # 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 os
 
 from common import chromium_utils
 
 from master import master_utils
 from master import slaves_list
 from master.builders_pools import BuildersPools
 from master.factory import annotator_factory
 from master.try_job_http import TryJobHTTP
 
 import config
 import master_site_config
 
 ActiveMaster = master_site_config.V8TryServer
 MAIL_NOTIFIER = True
 LISTEN_TO_SVN = ActiveMaster.svn_url and ActiveMaster.is_production_host
 
 # This is the dictionary that the buildmaster pays attention to. We also use
 # a shorter alias to save typing.
 c = BuildmasterConfig = {}
 c['status'] = []
 
 ####### DATABASE
-config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
+config.DatabaseSetup(c)
 
 ####### CHANGESOURCES
 c['change_source'] = []
 
 # Avoid merging requests.
 c['mergeRequests'] = lambda *_: False
 
 m_annotator = annotator_factory.AnnotatorFactory(ActiveMaster)
 
 # ----------------------------------------------------------------------------
@@ skipping 245 matching lines @@
 c['logHorizon'] = 2000
 # Must be at least 2x the number of slaves.
 c['eventHorizon'] = 60
 # Must be at least 2x the number of on-going builds.
 c['buildCacheSize'] = 60
 
 ####### PROJECT IDENTITY
 
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url