Use a new Supplement constructor for ServiceWorkerRegistration supplements

third_party/WebKit/Source/modules/push_messaging/ServiceWorkerRegistrationPush.cpp

 // Copyright 2014 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 "modules/push_messaging/ServiceWorkerRegistrationPush.h"
 
 #include "modules/push_messaging/PushManager.h"
 #include "modules/serviceworkers/ServiceWorkerRegistration.h"
 
 namespace blink {
 
 ServiceWorkerRegistrationPush::ServiceWorkerRegistrationPush(
-    ServiceWorkerRegistration* registration)
-    : m_registration(registration) {}
+    ServiceWorkerRegistration& registration)
+    : Supplement<ServiceWorkerRegistration>(registration) {}
 
 ServiceWorkerRegistrationPush::~ServiceWorkerRegistrationPush() {}
 
 const char* ServiceWorkerRegistrationPush::supplementName() {
   return "ServiceWorkerRegistrationPush";
 }
 
 ServiceWorkerRegistrationPush& ServiceWorkerRegistrationPush::from(
     ServiceWorkerRegistration& registration) {
   ServiceWorkerRegistrationPush* supplement =
       static_cast<ServiceWorkerRegistrationPush*>(
           Supplement<ServiceWorkerRegistration>::from(registration,
                                                       supplementName()));
   if (!supplement) {
-    supplement = new ServiceWorkerRegistrationPush(&registration);
+    supplement = new ServiceWorkerRegistrationPush(registration);
     provideTo(registration, supplementName(), supplement);
   }
   return *supplement;
 }
 
 PushManager* ServiceWorkerRegistrationPush::pushManager(
     ServiceWorkerRegistration& registration) {
   return ServiceWorkerRegistrationPush::from(registration).pushManager();
 }
 
 PushManager* ServiceWorkerRegistrationPush::pushManager() {
   if (!m_pushManager)
-    m_pushManager = PushManager::create(m_registration);
+    m_pushManager = PushManager::create(supplementable());
   return m_pushManager.get();
 }
 
 DEFINE_TRACE(ServiceWorkerRegistrationPush) {
-  visitor->trace(m_registration);
   visitor->trace(m_pushManager);
   Supplement<ServiceWorkerRegistration>::trace(visitor);
 }
 
 }  // namespace blink