Reduce forward declarations in core/rendering

Source/core/rendering/RenderBR.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.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
@@ skipping 11 matching lines @@
 #define RenderBR_h
 
 #include "core/rendering/RenderText.h"
 
 /*
  * The whole class here is a hack to get <br> working, as long as we don't have support for
  * CSS2 :before and :after pseudo elements
  */
 namespace WebCore {
 
-class Position;
-
 class RenderBR FINAL : public RenderText {
 public:
     explicit RenderBR(Node*);
     virtual ~RenderBR();
 
     virtual const char* renderName() const OVERRIDE { return "RenderBR"; }
 
     virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* /*paintInvalidationContainer*/, bool /*clipToVisibleContent*/) OVERRIDE { return LayoutRect(); }
 
     virtual float width(unsigned /*from*/, unsigned /*len*/, const Font&, float /*xPos*/, TextDirection, HashSet<const SimpleFontData*>* = 0 /*fallbackFonts*/ , GlyphOverflow* = 0) const OVERRIDE { return 0; }
@@ skipping 11 matching lines @@
 
 protected:
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBR, isBR());
 
 } // namespace WebCore
 
 #endif // RenderBR_h