Oilpan: Replace RefPtrs to Node and its subclasses in core/loader with Oilpan transition types.

Source/core/loader/DocumentLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 123 matching lines @@
         bool isRedirect() const { return m_redirectChain.size() > 1; }
         void clearRedirectChain();
         void appendRedirect(const KURL&);
 
     protected:
         DocumentLoader(LocalFrame*, const ResourceRequest&, const SubstituteData&);
 
         Vector<KURL> m_redirectChain;
 
     private:
-        static PassRefPtr<DocumentWriter> createWriterFor(LocalFrame*, const Document* ownerDocument, const KURL&, const AtomicString& mimeType, const AtomicString& encoding, bool userChosen, bool dispatch);
+        static PassRefPtrWillBeRawPtr<DocumentWriter> createWriterFor(LocalFrame*, const Document* ownerDocument, const KURL&, const AtomicString& mimeType, const AtomicString& encoding, bool userChosen, bool dispatch);
 
         void ensureWriter(const AtomicString& mimeType, const KURL& overridingURL = KURL());
         void endWriting(DocumentWriter*);
 
         Document* document() const;
         FrameLoader* frameLoader() const;
 
         void commitIfReady();
         void commitData(const char* bytes, size_t length);
         void setMainDocumentError(const ResourceError&);
@@ skipping 19 matching lines @@
 
         bool isRedirectAfterPost(const ResourceRequest&, const ResourceResponse&);
 
         bool shouldContinueForResponse() const;
 
         LocalFrame* m_frame;
         RefPtrWillBePersistent<ResourceFetcher> m_fetcher;
 
         ResourcePtr<RawResource> m_mainResource;
 
-        RefPtr<DocumentWriter> m_writer;
+        RefPtrWillBePersistent<DocumentWriter> m_writer;
 
         // A reference to actual request used to create the data source.
         // The only part of this request that should change is the url, and
         // that only in the case of a same-document navigation.
         ResourceRequest m_originalRequest;
 
         SubstituteData m_substituteData;
 
         // The 'working' request. It may be mutated
         // several times from the original request to include additional
@@ skipping 21 matching lines @@
         DocumentLoadTiming m_documentLoadTiming;
 
         double m_timeOfLastDataReceived;
 
         friend class ApplicationCacheHost;  // for substitute resource delivery
         OwnPtr<ApplicationCacheHost> m_applicationCacheHost;
     };
 }
 
 #endif // DocumentLoader_h