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

masters/master.chromium.infra.cron/master.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # Copyright 2015 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 config
 import master_site_config
 
@@ skipping 30 matching lines @@
 def m_remote_run(recipe, **kwargs):
   return remote_run_factory.RemoteRunFactory(
       active_master=ActiveMaster,
       repository='https://chromium.googlesource.com/chromium/tools/build.git',
       recipe=recipe,
       factory_properties={'path_config': 'kitchen'},
       **kwargs)
 
 ####### DATABASE
 
-config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
+config.DatabaseSetup(c)
 
 
 ####### CHANGE SOURCES
 INFRA_REPO_URL = 'https://chromium.googlesource.com/infra/infra'
 
 c['change_source'].extend([
   gitiles_poller.GitilesPoller('https://chromium.googlesource.com/infra/infra'),
 ])
 
 ####### BUILDERS
@@ skipping 194 matching lines @@
       sendToInterestedUsers=False,
       extraRecipients=['blink-infra+alerts@google.com',
                        'chrome-troopers+alerts@google.com'],
   ),
 ])
 
 ####### PROJECT IDENTITY
 
 c['projectName'] = ActiveMaster.project_name
 c['buildbotURL'] = ActiveMaster.buildbot_url