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

masters/master.tryserver.blink/master.cfg

 # -*- python -*-
 # ex: set syntax=python:
 # Copyright 2014 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.
 
 # READ THIS:
 # See http://dev.chromium.org/developers/testing/chromium-build-infrastructure
 
 import os
@@ skipping 10 matching lines @@
 
 ActiveMaster = master_site_config.BlinkTryServer
 
 
 MAIL_NOTIFIER = 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 = {}
 
-config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
+config.DatabaseSetup(c)
 
 c['change_source'] = []
 
 # Avoid merging requests.
 c['mergeRequests'] = lambda *_: False
 
 m_annotator = annotator_factory.AnnotatorFactory(ActiveMaster)
 
 c['builders'] = []
 for platform in ['linux', 'mac', 'win']:
@@ skipping 60 matching lines @@
 c['logHorizon'] = 3000
 # Must be at least 2x the number of slaves.
 c['eventHorizon'] = 200
 
 # Adjust the buildCaches to be 3x the number of slaves per builder.
 c['autoBuildCacheRatio'] = 3
 
 c['projectURL'] = 'http://dev.chromium.org/developers/testing/try-server-usage'
 
 # vi: set ts=4 sts=2 sw=2 et: