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

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"
@@ skipping 99 matching lines @@
                    pattern,
                    continuation));
     return;
   }
 
   context()->UnregisterServiceWorker(
       pattern,
       base::Bind(&FinishUnregistrationOnIO, continuation));
 }
 
+void ServiceWorkerContextWrapper::Terminate() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  process_manager_->Shutdown();
+}
+
 void ServiceWorkerContextWrapper::AddObserver(
     ServiceWorkerContextObserver* observer) {
   observer_list_->AddObserver(observer);
 }
 
 void ServiceWorkerContextWrapper::RemoveObserver(
     ServiceWorkerContextObserver* observer) {
   observer_list_->RemoveObserver(observer);
 }
 
@@ skipping 22 matching lines @@
                                                    observer_list_,
                                                    this));
 }
 
 void ServiceWorkerContextWrapper::ShutdownOnIO() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   context_core_.reset();
 }
 
 }  // namespace content