Revert of Oilpan: enable appcache + move DocumentLoader to the heap.

Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1361 matching lines @@
 
     return true;
 }
 
 void LocalDOMWindow::dispatchLoadEvent()
 {
     RefPtrWillBeRawPtr<Event> loadEvent(Event::create(EventTypeNames::load));
     if (frame() && frame()->loader().documentLoader() && !frame()->loader().documentLoader()->timing().loadEventStart()) {
         // The DocumentLoader (and thus its DocumentLoadTiming) might get destroyed while dispatching
         // the event, so protect it to prevent writing the end time into freed memory.
-        RefPtrWillBeRawPtr<DocumentLoader> documentLoader = frame()->loader().documentLoader();
+        RefPtr<DocumentLoader> documentLoader = frame()->loader().documentLoader();
         DocumentLoadTiming& timing = documentLoader->timing();
         timing.markLoadEventStart();
         dispatchEvent(loadEvent, document());
         timing.markLoadEventEnd();
     } else
         dispatchEvent(loadEvent, document());
 
     // For load events, send a separate load event to the enclosing frame only.
     // This is a DOM extension and is independent of bubbling/capturing rules of
     // the DOM.
@@ skipping 130 matching lines @@
     DOMWindow::trace(visitor);
     DOMWindowLifecycleNotifier::trace(visitor);
 }
 
 LocalFrame* LocalDOMWindow::frame() const
 {
     return m_frameObserver->frame();
 }
 
 } // namespace blink