Main waterfall blink testers should not compile locally.

scripts/slave/recipe_modules/chromium_tests/chromium_webkit.py

 # Copyright 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.
 
 from . import steps
 
 SPEC = {
   'settings': {
     'build_gs_bucket': 'chromium-webkit-archive',
     'src_side_runtest_py': False,
@@ skipping 153 matching lines @@
     'checkout_dir': 'mac_layout',
   },
   'WebKit Mac10.11 (retina)': {
     'chromium_config': 'chromium',
     'chromium_apply_config': ['mb'],
     'gclient_config': 'chromium',
     'chromium_config_kwargs': {
       'BUILD_CONFIG': 'Release',
       'TARGET_BITS': 64,
     },
-    'compile_targets': [
-      'blink_tests',
-    ],
+    'bot_type': 'tester',
+    'parent_buildername': 'WebKit Mac Builder',
     'tests': [
       steps.BlinkTest(),
     ],
     'testing': {
       'platform': 'mac',
     },
     'enable_swarming': True,
     'swarming_dimensions': {
       'os': 'Mac-10.11',
       'hidpi': '1',
     },
     'use_isolate': True,
     'checkout_dir': 'mac_layout',
   },
   'WebKit Mac10.9': {
     'chromium_config': 'chromium',
     'chromium_apply_config': ['mb'],
     'gclient_config': 'chromium',
     'chromium_config_kwargs': {
       'BUILD_CONFIG': 'Release',
       'TARGET_BITS': 64,
     },
-    'bot_type': 'builder',
+    'bot_type': 'tester',
+    'parent_buildername': 'WebKit Mac Builder',
     'tests': [
       steps.BlinkTest(),
     ],
     'testing': {
       'platform': 'mac',
     },
     'enable_swarming': True,
     'swarming_dimensions': {
       'os': 'Mac-10.9',
     },
@@ skipping 259 matching lines @@
           '--options=--enable-leak-detection',
       ]),
     ],
     'testing': {
       'platform': 'linux',
     },
     'enable_swarming': True,
     'use_isolate': True,
   },
 }