ServiceWorker: Confirm the liveness of the associated context before handling message

content/content_browser.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
@@ skipping 1176 matching lines @@
       'browser/service_worker/service_worker_info.cc',
       'browser/service_worker/service_worker_info.h',
       'browser/service_worker/service_worker_internals_ui.cc',
       'browser/service_worker/service_worker_internals_ui.h',
       'browser/service_worker/service_worker_job_coordinator.cc',
       'browser/service_worker/service_worker_job_coordinator.h',
       'browser/service_worker/service_worker_process_manager.cc',
       'browser/service_worker/service_worker_process_manager.h',
       'browser/service_worker/service_worker_provider_host.cc',
       'browser/service_worker/service_worker_provider_host.h',
+      'browser/service_worker/service_worker_provider_host_registry.cc',
+      'browser/service_worker/service_worker_provider_host_registry.h',
       'browser/service_worker/service_worker_read_from_cache_job.cc',
       'browser/service_worker/service_worker_read_from_cache_job.h',
       'browser/service_worker/service_worker_register_job_base.h',
       'browser/service_worker/service_worker_register_job.cc',
       'browser/service_worker/service_worker_register_job.h',
       'browser/service_worker/service_worker_registration.cc',
       'browser/service_worker/service_worker_registration.h',
       'browser/service_worker/service_worker_registration_status.cc',
       'browser/service_worker/service_worker_registration_status.h',
       'browser/service_worker/service_worker_request_handler.cc',
@@ skipping 559 matching lines @@
       'sources': [
         'browser/media/cdm/browser_cdm_manager.cc',
         'browser/media/cdm/browser_cdm_manager.h',
         # This works on Android because enable_browser_cdms==1 on Android.
         'browser/media/media_web_contents_observer.cc',
         'browser/media/media_web_contents_observer.h',
       ],
     }],
   ],
 }