Suppress the exception thrown when responding to message with no response callback.

chrome/chrome_tests.gypi

 # Copyright 2013 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.
 {
   'includes': [
     'js_unittest_vars.gypi',
   ],
   'targets': [
     {
       'target_name': 'interactive_ui_tests',
@@ skipping 1224 matching lines @@
         'browser/extensions/extension_resource_request_policy_apitest.cc',
         'browser/extensions/extension_startup_browsertest.cc',
         'browser/extensions/extension_storage_apitest.cc',
         'browser/extensions/extension_storage_monitor_browsertest.cc',
         'browser/extensions/extension_tabs_apitest.cc',
         'browser/extensions/extension_url_rewrite_browsertest.cc',
         'browser/extensions/extension_view_host_factory_browsertest.cc',
         'browser/extensions/extension_websocket_apitest.cc',
         'browser/extensions/extension_webui_apitest.cc',
         'browser/extensions/gpu_browsertest.cc',
+        'browser/extensions/hotword_browsertest.cc',
         'browser/extensions/isolated_app_browsertest.cc',
         'browser/extensions/lazy_background_page_apitest.cc',
         'browser/extensions/lazy_background_page_test_util.h',
         'browser/extensions/mutation_observers_apitest.cc',
         'browser/extensions/options_page_apitest.cc',
         'browser/extensions/page_action_browsertest.cc',
         'browser/extensions/plugin_apitest.cc',
         'browser/extensions/process_management_browsertest.cc',
         'browser/extensions/process_manager_browsertest.cc',
         'browser/extensions/requirements_checker_browsertest.cc',
@@ skipping 1801 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }