WebRTC: Remove Valgrind based FYI bots.

masters/master.client.webrtc.fyi/master.cfg

 # 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.
 
 # These modules come from scripts/master, which must be in the PYTHONPATH.
 from master import master_utils
 from master import slaves_list
 
 import config
 import master_site_config
 ActiveMaster = master_site_config.WebRTCFYI
 
 c = BuildmasterConfig = {}
 c['change_source'] = []
 c['schedulers'] = []
 c['builders'] = []
 c['status'] = []
 
 config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
 
 import master_source_cfg
 import master_linux_cfg
-import master_mac_cfg
 import master_win_cfg
 
 master_source_cfg.Update(config, c)
 master_linux_cfg.Update(c)
-master_mac_cfg.Update(c)
 master_win_cfg.Update(c)
 
 # Must come before AutoSetupMaster().
 c['buildbotURL'] = ActiveMaster.buildbot_url
 
 # Associate the slaves to the manual builders. The configuration is in
 # slaves.cfg.
 slaves = slaves_list.SlavesList('slaves.cfg', 'WebRTCFYI')
 for builder in c['builders']:
   builder['slavenames'] = slaves.GetSlavesName(builder=builder['name'])
@@ skipping 26 matching lines @@
       extraRecipients=[ActiveMaster.from_address],
       mode='problem',
       relayhost=config.Master.smtp))
 
 # Do it at the end to override values set by AutoSetupMaster, the default is
 # too low. Must keep at least a few days worth of builds.
 c['buildHorizon'] = 3000
 c['logHorizon'] = 3000
 # Must be at least 2x the number of slaves.
 c['eventHorizon'] = 200