[WIP] [service worker] Fix detach controller and fallback to network mechanism

content/child/service_worker/service_worker_dispatcher.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/child/service_worker/service_worker_dispatcher.h"
 
 #include "base/lazy_instance.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 246 matching lines @@
       g_dispatcher_tls.Pointer()->Get());
 }
 
 void ServiceWorkerDispatcher::WillStopCurrentWorkerThread() {
   delete this;
 }
 
 scoped_refptr<WebServiceWorkerImpl>
 ServiceWorkerDispatcher::GetOrCreateServiceWorker(
     scoped_ptr<ServiceWorkerHandleReference> handle_ref) {
-  if (handle_ref->handle_id() == kInvalidServiceWorkerHandleId)
+  if (!handle_ref)
     return nullptr;
 
   WorkerObjectMap::iterator found =
       service_workers_.find(handle_ref->handle_id());
   if (found != service_workers_.end())
     return found->second;
 
   // WebServiceWorkerImpl constructor calls AddServiceWorker.
   return new WebServiceWorkerImpl(handle_ref.Pass(), thread_safe_sender_.get());
 }
@@ skipping 484 matching lines @@
   return ServiceWorkerRegistrationHandleReference::Adopt(
       info, thread_safe_sender_.get());
 }
 
 scoped_ptr<ServiceWorkerHandleReference> ServiceWorkerDispatcher::Adopt(
     const ServiceWorkerObjectInfo& info) {
   return ServiceWorkerHandleReference::Adopt(info, thread_safe_sender_.get());
 }
 
 }  // namespace content