Do not trigger presubmit trybots from local presubmit

PRESUBMIT.py

 # Copyright (c) 2012 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 Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 1665 matching lines @@
   import json
   with open(os.path.join(
       change.RepositoryRoot(), 'testing', 'commit_queue', 'config.json')) as f:
     cq_config = json.load(f)
     cq_trybots = cq_config.get('trybots', {})
     builders = cq_trybots.get('launched', {})
     for master, master_config in cq_trybots.get('triggered', {}).iteritems():
       for triggered_bot in master_config:
         builders.get(master, {}).pop(triggered_bot, None)
 
+    # Explicitly iterate over copies of dicts since we mutate them.
+    for master in builders.keys():
+      for builder in builders[master].keys():
+        # 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' in builder:
+          builders[master].pop(builder)
+
   # Match things like path/aura/file.cc and path/file_aura.cc.
   # Same for chromeos.
   if any(re.search(r'[\\\/_](aura|chromeos)', f) for f in files):
     tryserver_linux = builders.setdefault('tryserver.chromium.linux', {})
     tryserver_linux['linux_chromium_chromeos_asan_rel_ng'] = ['defaulttests']
 
   return builders