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

Source/core/loader/EmptyClients.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * 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.
@@ skipping 91 matching lines @@
 }
 
 void EmptyFrameLoaderClient::dispatchWillSendSubmitEvent(HTMLFormElement*)
 {
 }
 
 void EmptyFrameLoaderClient::dispatchWillSubmitForm(HTMLFormElement*)
 {
 }
 
-PassRefPtrWillBeRawPtr<DocumentLoader> EmptyFrameLoaderClient::createDocumentLoader(LocalFrame* frame, const ResourceRequest& request, const SubstituteData& substituteData)
+PassRefPtr<DocumentLoader> EmptyFrameLoaderClient::createDocumentLoader(LocalFrame* frame, const ResourceRequest& request, const SubstituteData& substituteData)
 {
     return DocumentLoader::create(frame, request, substituteData);
 }
 
 PassRefPtrWillBeRawPtr<LocalFrame> EmptyFrameLoaderClient::createFrame(const FrameLoadRequest&, const AtomicString&, HTMLFrameOwnerElement*)
 {
     return nullptr;
 }
 
 PassOwnPtrWillBeRawPtr<PluginPlaceholder> EmptyFrameLoaderClient::createPluginPlaceholder(Document&, const KURL&, const Vector<String>& paramNames, const Vector<String>& paramValues, const String& mimeType, bool loadManually)
@@ skipping 23 matching lines @@
 {
     return nullptr;
 }
 
 PassOwnPtr<WebApplicationCacheHost> EmptyFrameLoaderClient::createApplicationCacheHost(WebApplicationCacheHostClient*)
 {
     return nullptr;
 }
 
 } // namespace blink