Get rid of GetPreferredTryMasters.

PRESUBMIT.py

 # Copyright (c) 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.
 
 """Top-level presubmit script for infra.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
 details on the presubmit API built into gcl.
 """
 
@@ skipping 368 matching lines @@
 def CheckChangeOnCommit(input_api, output_api):  # pragma: no cover
   output = CommonChecks(input_api, output_api)
   output.extend(input_api.RunTests(
     PylintChecks(input_api, output_api, only_changed=False)))
   output.extend(input_api.canned_checks.CheckOwners(input_api, output_api))
   output.extend(input_api.canned_checks.CheckTreeIsOpen(
       input_api,
       output_api,
       json_url='http://infra-status.appspot.com/current?format=json'))
   return output
-
-
-# Unused argument - pylint: disable=W0613
-def GetPreferredTryMasters(project, change):  # pragma: no cover
-  import json
-  import os.path
-  import platform
-  import subprocess
-  cq_config_path = os.path.join(
-      change.RepositoryRoot(), 'config', 'cq.cfg')
-  # commit_queue.py below is a script in depot_tools directory, which has a
-  # 'builders' command to retrieve a list of CQ builders from the CQ config.
-  is_win = platform.system() == 'Windows'
-  masters = json.loads(subprocess.check_output(
-      ['commit_queue', 'builders', cq_config_path], shell=is_win))
-  try_config = {}
-  for master in masters:
-      try_config.setdefault(master, {})
-      for builder in masters[master]:
-          # Do not trigger presubmit builders, since they're likely to fail
-          # (e.g. OWNERS checks before finished code review), and we're
-          # running local presubmit anyway.
-          if 'presubmit' not in builder.lower():
-              try_config[master][builder] = ['defaulttests']
-  return try_config