Clean up forward declarations in WebKit/Source

Source/core/rendering/RenderQuote.h

 /*
  * Copyright (C) 2011 Nokia Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * 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,
@@ skipping 12 matching lines @@
 #define RenderQuote_h
 
 #include "core/rendering/RenderInline.h"
 #include "core/rendering/style/QuotesData.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 
 namespace blink {
 
 class Document;
+class RenderTextFragment;
 
 class RenderQuote final : public RenderInline {
 public:
     RenderQuote(Document*, const QuoteType);
     virtual ~RenderQuote();
     virtual void trace(Visitor*) override;
     void attachQuote();
 
 private:
     void detachQuote();
@@ skipping 20 matching lines @@
     String m_text;
 };
 
 WILL_NOT_BE_EAGERLY_TRACED_CLASS(RenderQuote);
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderQuote, isQuote());
 
 } // namespace blink
 
 #endif // RenderQuote_h