Refactoring: Generalize CachedSVGDocument for non-SVG use.

Source/core/loader/cache/CachedSVGDocumentReference.h

 /*
  * Copyright (C) 2012 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:
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  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
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  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 #ifndef CachedSVGDocumentReference_h
 #define CachedSVGDocumentReference_h
 
+#include "core/loader/cache/CachedDocument.h"
 #include "core/loader/cache/CachedResourceHandle.h"
-#include "core/loader/cache/CachedSVGDocument.h"
 
 namespace WebCore {
 
-class CachedSVGDocumentReference : public CachedSVGDocumentClient {
+class CachedSVGDocumentReference : public CachedDocumentClient {
 public:
-    CachedSVGDocumentReference(CachedSVGDocument* document) : m_document(document) { m_document->addClient(this); }
+    CachedSVGDocumentReference(CachedDocument* document) : m_document(document) { m_document->addClient(this); }
     virtual ~CachedSVGDocumentReference() { m_document->removeClient(this); }
-    CachedSVGDocument* document() { return m_document.get(); }
+    CachedDocument* document() { return m_document.get(); }
 private:
-    CachedResourceHandle<CachedSVGDocument> m_document;
+    CachedResourceHandle<CachedDocument> m_document;
 };
 
 };
 
 #endif