Get rid of GetPreferredTryMasters that just loads cq.cfg.

git cl try now schedules CQ dry run by default.

BUG=577224
R=sergiyb@chromium.org,phajdan.jr@chromium.org

Review-Url: https://codereview.chromium.org/2151543002
Cr-Commit-Position: refs/heads/master@{#405218}

third_party/WebKit/PRESUBMIT.py

@@ -320,30 +320,3 @@ def CheckChangeOnCommit(input_api, output_api):
     results.extend(input_api.canned_checks.CheckChangeHasDescription(
         input_api, output_api))
     return results
-
-
-def GetPreferredTryMasters(project, change):
-    import json
-    import os.path
-    import platform
-    import subprocess
-
-    cq_config_path = os.path.join(
-        change.RepositoryRoot(), 'infra', '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:
-                try_config[master][builder] = ['defaulttests']
-
-    return try_config