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

Source/core/layout/svg/LayoutSVGResourcePaintServer.h

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 59 matching lines @@
 
     LayoutSVGResourcePaintServer* resource;
     Color color;
     bool isValid;
     bool hasFallback;
 };
 
 class LayoutSVGResourcePaintServer : public LayoutSVGResourceContainer {
 public:
     LayoutSVGResourcePaintServer(SVGElement*);
-    virtual ~LayoutSVGResourcePaintServer();
+    ~LayoutSVGResourcePaintServer() override;
 
     virtual SVGPaintServer preparePaintServer(const LayoutObject&) = 0;
 
     // Helper utilities used in to access the underlying resources for DRT.
     static SVGPaintDescription requestPaintDescription(const LayoutObject&, const ComputedStyle&, LayoutSVGResourceMode);
 };
 
 DEFINE_TYPE_CASTS(LayoutSVGResourcePaintServer, LayoutSVGResourceContainer, resource, resource->isSVGPaintServer(), resource.isSVGPaintServer());
 
 }
 
 #endif