Shut down the ServiceWorker system as the browser's shutting down.

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 885 matching lines @@
         'browser/browsing_data/browsing_data_indexed_db_helper_browsertest.cc',
         'browser/browsing_data/browsing_data_local_storage_helper_browsertest.cc',
         'browser/browsing_data/browsing_data_remover_browsertest.cc',
         'browser/browsing_data/browsing_data_remover_test_util.cc',
         'browser/browsing_data/browsing_data_remover_test_util.h',
         'browser/captive_portal/captive_portal_browsertest.cc',
         'browser/chrome_content_browser_client_browsertest.cc',
         'browser/chrome_main_browsertest.cc',
         'browser/chrome_plugin_browsertest.cc',
         'browser/chrome_security_exploit_browsertest.cc',
+        'browser/chrome_service_worker_browsertest.cc',
         'browser/chrome_switches_browsertest.cc',
         'browser/chromeos/accessibility/accessibility_manager_browsertest.cc',
         'browser/chromeos/accessibility/magnification_manager_browsertest.cc',
         'browser/chromeos/accessibility/speech_monitor.cc',
         'browser/chromeos/accessibility/speech_monitor.h',
         'browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc',
         'browser/chromeos/app_mode/kiosk_app_manager_browsertest.cc',
         'browser/chromeos/app_mode/kiosk_app_update_service_browsertest.cc',
         'browser/chromeos/attestation/attestation_policy_browsertest.cc',
         'browser/chromeos/customization_wallpaper_downloader_browsertest.cc',
@@ skipping 2076 matching lines @@
             ['enable_webrtc==1', {
               'dependencies': [
                 '../third_party/libjingle/libjingle.gyp:libjingle_webrtc'
               ]
             }],
           ],
         }]
     }],
   ],  # 'conditions'
 }