Fix virtual/override/final usage in Source/core/layout/.

Source/core/layout/svg/LayoutSVGResourceGradient.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
@@ skipping 24 matching lines @@
     WTF_MAKE_FAST_ALLOCATED(GradientData);
 public:
     RefPtr<Gradient> gradient;
     AffineTransform userspaceTransform;
 };
 
 class LayoutSVGResourceGradient : public LayoutSVGResourcePaintServer {
 public:
     explicit LayoutSVGResourceGradient(SVGGradientElement*);
 
-    virtual void removeAllClientsFromCache(bool markForInvalidation = true) override final;
-    virtual void removeClientFromCache(LayoutObject*, bool markForInvalidation = true) override final;
+    void removeAllClientsFromCache(bool markForInvalidation = true) final;
+    void removeClientFromCache(LayoutObject*, bool markForInvalidation = true) final;
 
-    virtual SVGPaintServer preparePaintServer(const LayoutObject&) override final;
+    SVGPaintServer preparePaintServer(const LayoutObject&) final;
 
-    virtual bool isChildAllowed(LayoutObject* child, const ComputedStyle&) const override final;
+    bool isChildAllowed(LayoutObject* child, const ComputedStyle&) const final;
 
 protected:
     void addStops(GradientData*, const Vector<Gradient::ColorStop>&) const;
 
     virtual SVGUnitTypes::SVGUnitType gradientUnits() const = 0;
     virtual void calculateGradientTransform(AffineTransform&) = 0;
     virtual bool collectGradientAttributes(SVGGradientElement*) = 0;
     virtual void buildGradient(GradientData*) const = 0;
 
     GradientSpreadMethod platformSpreadMethodFromSVGType(SVGSpreadMethodType) const;
 
 private:
     bool m_shouldCollectGradientAttributes : 1;
     HashMap<const LayoutObject*, OwnPtr<GradientData>> m_gradientMap;
 };
 
 }
 
 #endif