Update accessibility classes to use OVERRIDE / FINAL when needed

Source/core/accessibility/AXListBox.h

 /*
  * Copyright (C) 2008 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 AXListBox_h
 #define AXListBox_h
 
 #include "core/accessibility/AXRenderObject.h"
 
 namespace WebCore {
 
-class AXListBox : public AXRenderObject {
+class AXListBox FINAL : public AXRenderObject {
 
 private:
     explicit AXListBox(RenderObject*);
 public:
     static PassRefPtr<AXListBox> create(RenderObject*);
     virtual ~AXListBox();
 
     virtual bool canSetSelectedChildrenAttribute() const OVERRIDE;
     void setSelectedChildren(AccessibilityChildrenVector&);
     virtual AccessibilityRole roleValue() const OVERRIDE { return ListBoxRole; }
 
     virtual void selectedChildren(AccessibilityChildrenVector&) OVERRIDE;
 
     virtual void addChildren() OVERRIDE;
 
 private:
     AXObject* listBoxOptionAXObject(HTMLElement*) const;
     virtual AXObject* elementAccessibilityHitTest(const IntPoint&) const OVERRIDE;
 };
 
 } // namespace WebCore
 
 #endif // AXListBox_h