Make WebKit Mac10.9 (retina) bot not use the 10.6 SDK.

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.
 
 import copy
 
 from . import chromium_chromiumos
 from . import steps
 
 SPEC = copy.deepcopy(chromium_chromiumos.SPEC)
@@ skipping 273 matching lines @@
       steps.BlinkTest(),
     ],
     'testing': {
       'platform': 'mac',
     },
     'enable_swarming': True,
     'use_isolate': True,
   },
   'WebKit Mac10.9 (retina)': {
     'chromium_config': 'chromium',
-    'chromium_apply_config': ['chromium_mac_sdk_10_6'],
     'gclient_config': 'chromium',
     'gclient_apply_config': ['blink_or_chromium'],
     'chromium_config_kwargs': {
       'BUILD_CONFIG': 'Release',
       'TARGET_BITS': 64,
     },
     'compile_targets': [
       'blink_tests',
     ],
     'test_generators': [
@@ skipping 564 matching lines @@
           'src/third_party/WebKit/LayoutTests/OilpanExpectations',
       ]),
     ],
     'testing': {
       'platform': 'linux',
     },
     'enable_swarming': True,
     'use_isolate': True,
   },
 })