Have Frame::loader() return a reference

Source/modules/serviceworkers/NavigatorServiceWorker.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 56 matching lines @@
 {
     return "NavigatorServiceWorker";
 }
 
 WebServiceWorkerProvider* NavigatorServiceWorker::ensureProvider()
 {
     ASSERT(m_navigator->frame());
     if (!m_provider) {
         Frame* frame = m_navigator->frame();
 
-        FrameLoaderClient* client = frame->loader()->client();
+        FrameLoaderClient* client = frame->loader().client();
         // FIXME: This is temporarily hooked up here until we hook up to the loading process.
         m_provider = client->createServiceWorkerProvider(nullptr);
     }
     return m_provider.get();
 }
 
 NavigatorServiceWorker* NavigatorServiceWorker::from(Navigator* navigator)
 {
     NavigatorServiceWorker* supplement = toNavigatorServiceWorker(navigator);
     if (!supplement) {
@@ skipping 67 matching lines @@
 }
 
 void NavigatorServiceWorker::willDetachGlobalObjectFromFrame()
 {
     m_provider = nullptr;
     DOMWindowProperty::willDetachGlobalObjectFromFrame();
 }
 
 
 } // namespace WebCore