Get rid of GetPreferredTryMasters.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index da195a49c20e086390a4f15500c7ce9013b2d58d..f40b33b192681746ab22d2f5254b0243dd7da9cc 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -386,28 +386,3 @@ def CheckChangeOnCommit(input_api, output_api):  # pragma: no cover
       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