Make DocumentResource to be a subclass of TextResource

third_party/WebKit/Source/core/fetch/DocumentResource.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 DocumentResource_h
 #define DocumentResource_h
 
 #include "core/fetch/Resource.h"
 #include "core/fetch/ResourceClient.h"
+#include "core/fetch/TextResource.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "platform/heap/Handle.h"
 #include <memory>
 
 namespace blink {
 
 class Document;
 class FetchRequest;
 class ResourceFetcher;
 
-class CORE_EXPORT DocumentResource final : public Resource {
+class CORE_EXPORT DocumentResource final : public TextResource {
 public:
     using ClientType = ResourceClient;
 
     static DocumentResource* fetchSVGDocument(FetchRequest&, ResourceFetcher*);
     ~DocumentResource() override;
     DECLARE_VIRTUAL_TRACE();
 
     Document* document() const { return m_document.get(); }
 
-    void setEncoding(const String&) override;
-    String encoding() const override;
     void checkNotify() override;
 
 private:
     class SVGDocumentResourceFactory : public ResourceFactory {
     public:
         SVGDocumentResourceFactory()
             : ResourceFactory(Resource::SVGDocument) { }
 
         Resource* create(const ResourceRequest& request, const ResourceLoaderOptions& options, const String& charset) const override
         {
             return new DocumentResource(request, Resource::SVGDocument, options);
         }
     };
     DocumentResource(const ResourceRequest&, Type, const ResourceLoaderOptions&);
 
     bool mimeTypeAllowed() const;
     Document* createDocument(const KURL&);
 
     Member<Document> m_document;
-    std::unique_ptr<TextResourceDecoder> m_decoder;
 };
 
 DEFINE_TYPE_CASTS(DocumentResource, Resource, resource, resource->getType() == Resource::SVGDocument, resource.getType() == Resource::SVGDocument);
 
 class CORE_EXPORT DocumentResourceClient : public GarbageCollectedMixin, public ResourceClient {
 public:
     ~DocumentResourceClient() override {}
     static bool isExpectedType(ResourceClient* client) { return client->getResourceClientType() == DocumentType; }
     ResourceClientType getResourceClientType() const final { return DocumentType; }
     DEFINE_INLINE_VIRTUAL_TRACE() {}
 };
 
 } // namespace blink
 
 #endif // DocumentResource_h