Make ServiceWorkerRegisterJob accumulate registration state.

content/browser/service_worker/service_worker_register_job.h

Index: content/browser/service_worker/service_worker_register_job.h
diff --git a/content/browser/service_worker/service_worker_register_job.h b/content/browser/service_worker/service_worker_register_job.h
index 02f7494363210522c118e8d6b2b6755ec160fa06..1279857a50e4c7ea9b07dd44f34496190c565433 100644
--- a/content/browser/service_worker/service_worker_register_job.h
+++ b/content/browser/service_worker/service_worker_register_job.h
@@ -58,12 +58,13 @@ class ServiceWorkerRegisterJob : public ServiceWorkerRegisterJobBase {
       ServiceWorkerStatusCode status,
       const scoped_refptr<ServiceWorkerRegistration>& registration);
   void RegisterAndContinue(ServiceWorkerStatusCode status);
-  void StartWorkerAndContinue(ServiceWorkerStatusCode status);
-  void Complete(ServiceWorkerStatusCode status);
+  void StartWorkerAndContinue(ServiceWorkerRegistration* registration,
+                              ServiceWorkerStatusCode status);
+  void Complete(ServiceWorkerRegistration* registration,
+                ServiceWorkerStatusCode status);
 
   // The ServiceWorkerStorage object should always outlive this.
   base::WeakPtr<ServiceWorkerContextCore> context_;
-  scoped_refptr<ServiceWorkerRegistration> registration_;
   scoped_refptr<ServiceWorkerVersion> pending_version_;
   const GURL pattern_;
   const GURL script_url_;