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

content/browser/service_worker/service_worker_context_wrapper.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 
 #include "base/files/file_path.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_context_observer.h"
 #include "content/browser/service_worker/service_worker_process_manager.h"
+#include "content/browser/service_worker/service_worker_provider_host_registry.h"
 #include "content/public/browser/browser_thread.h"
 #include "webkit/browser/quota/quota_manager_proxy.h"
 
 namespace content {
 
 ServiceWorkerContextWrapper::ServiceWorkerContextWrapper(
     BrowserContext* browser_context)
     : observer_list_(
           new ObserverListThreadSafe<ServiceWorkerContextObserver>()),
       process_manager_(new ServiceWorkerProcessManager(browser_context)) {
@@ skipping 127 matching lines @@
                    make_scoped_refptr(quota_manager_proxy)));
     return;
   }
   DCHECK(!context_core_);
   context_core_.reset(new ServiceWorkerContextCore(user_data_directory,
                                                    database_task_runner,
                                                    disk_cache_thread,
                                                    quota_manager_proxy,
                                                    observer_list_,
                                                    this));
+  provider_registry_.reset(new ServiceWorkerProviderHostRegistry);
 }
 
 void ServiceWorkerContextWrapper::ShutdownOnIO() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  // TODO(nhiroki): Don't have to reset the registry on DeleteAndStartOver().
+  // (http://crbug.com/371675)
+  provider_registry_.reset();
   context_core_.reset();
 }
 
 }  // namespace content