Update accessibility classes to use OVERRIDE / FINAL when needed

Source/core/accessibility/AXSVGRoot.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AXSVGRoot_h
 #define AXSVGRoot_h
 
 #include "core/accessibility/AXRenderObject.h"
 
 namespace WebCore {
 
-class AXSVGRoot : public AXRenderObject {
+class AXSVGRoot FINAL : public AXRenderObject {
 
 protected:
     explicit AXSVGRoot(RenderObject*);
 public:
     static PassRefPtr<AXSVGRoot> create(RenderObject*);
     virtual ~AXSVGRoot();
 
     void setParent(AXObject* parent) { m_parent = parent; }
 
 private:
     AXObject* m_parent;
 
     virtual AXObject* parentObject() const OVERRIDE;
     virtual bool isAXSVGRoot() const OVERRIDE { return true; }
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXSVGRoot, isAXSVGRoot());
 
 } // namespace WebCore
 
 #endif // AXSVGRoot_h