Make Blacklist::IsBlacklist asynchronous (it will need to be for safe

chrome/chrome_tests.gypi

 # 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 961 matching lines @@
         'browser/extensions/content_security_policy_apitest.cc',
         'browser/extensions/convert_web_app_browsertest.cc',
         'browser/extensions/cross_origin_xhr_apitest.cc',
         'browser/extensions/crx_installer_browsertest.cc',
         'browser/extensions/docs/examples/apps/calculator_browsertest.cc',
         'browser/extensions/events_apitest.cc',
         'browser/extensions/execute_script_apitest.cc',
         'browser/extensions/extension_apitest.cc',
         'browser/extensions/extension_apitest.h',
         'browser/extensions/extension_bindings_apitest.cc',
+        'browser/extensions/extension_blacklist_browsertest.cc',
         'browser/extensions/extension_browsertest.cc',
         'browser/extensions/extension_browsertest.h',
         'browser/extensions/extension_context_menu_browsertest.cc',
         'browser/extensions/extension_devtools_browsertest.cc',
         'browser/extensions/extension_devtools_browsertest.h',
         'browser/extensions/extension_devtools_browsertests.cc',
         'browser/extensions/extension_disabled_ui_browsertest.cc',
         'browser/extensions/extension_dom_clipboard_apitest.cc',
         'browser/extensions/extension_fileapi_apitest.cc',
         'browser/extensions/extension_function_test_utils.cc',
@@ skipping 1867 matching lines @@
             'sync_integration_tests.isolate',
           ],
           'sources': [
             'sync_integration_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }