Refactoring: Generalize CachedSVGDocument for non-SVG use.

Source/core/loader/cache/CachedSVGDocument.h

-/*
-    Copyright (C) 2010 Rob Buis <rwlbuis@gmail.com>
-    Copyright (C) 2011 Cosmin Truta <ctruta@gmail.com>
-    Copyright (C) 2012 University of Szeged
-    Copyright (C) 2012 Renata Hodovan <reni@webkit.org>
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Library General Public
-    License as published by the Free Software Foundation; either
-    version 2 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Library General Public License for more details.
-
-    You should have received a copy of the GNU Library General Public License
-    along with this library; see the file COPYING.LIB.  If not, write to
-    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-    Boston, MA 02110-1301, USA.
-*/
-
-#ifndef CachedSVGDocument_h
-#define CachedSVGDocument_h
-
-#include "core/loader/TextResourceDecoder.h"
-#include "core/loader/cache/CachedResource.h"
-#include "core/loader/cache/CachedResourceClient.h"
-#include "core/loader/cache/CachedResourceHandle.h"
-#include "core/svg/SVGDocument.h"
-
-namespace WebCore {
-
-class CachedSVGDocument : public CachedResource {
-public:
-    explicit CachedSVGDocument(const ResourceRequest&);
-    virtual ~CachedSVGDocument();
-
-    SVGDocument* document() const { return m_document.get(); }
-
-    virtual void setEncoding(const String&);
-    virtual String encoding() const;
-    virtual void checkNotify() OVERRIDE;
-
-    virtual void reportMemoryUsage(MemoryObjectInfo*) const OVERRIDE;
-
-protected:
-    RefPtr<SVGDocument> m_document;
-    RefPtr<TextResourceDecoder> m_decoder;
-};
-
-class CachedSVGDocumentClient : public CachedResourceClient {
-public:
-    virtual ~CachedSVGDocumentClient() { }
-    static CachedResourceClientType expectedType() { return SVGDocumentType; }
-    virtual CachedResourceClientType resourceClientType() const { return expectedType(); }
-};
-
-}
-
-#endif // CachedSVGDocument_h