Move Resource subclasses out of fetch/

Source/core/fetch/TextResource.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef TextResource_h
-#define TextResource_h
-
-#include "core/CoreExport.h"
-#include "core/fetch/ResourcePtr.h"
-
-namespace blink {
-
-class TextResourceDecoder;
-
-class CORE_EXPORT TextResource : public Resource {
-public:
-    // Returns the decoded data in text form. The data has to be available at
-    // call time.
-    String decodedText() const;
-
-    virtual void setEncoding(const String&) override;
-    virtual String encoding() const override;
-
-protected:
-    TextResource(const ResourceRequest&, Type, const String& mimeType, const String& charset);
-    virtual ~TextResource();
-
-private:
-    OwnPtr<TextResourceDecoder> m_decoder;
-};
-
-}
-
-#endif // TextResource_h