Update accessibility classes to use OVERRIDE / FINAL when needed

Source/core/accessibility/AXARIAGridRow.h

 /*
  * Copyright (C) 2009 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 AXARIAGridRow_h
 #define AXARIAGridRow_h
 
 #include "core/accessibility/AXTableRow.h"
 
 namespace WebCore {
 
-class AXARIAGridRow : public AXTableRow {
+class AXARIAGridRow FINAL : public AXTableRow {
 
 private:
     explicit AXARIAGridRow(RenderObject*);
 public:
     static PassRefPtr<AXARIAGridRow> create(RenderObject*);
     virtual ~AXARIAGridRow();
 
     void disclosedRows(AccessibilityChildrenVector&);
     AXObject* disclosedByRow() const;
 
     virtual AXObject* headerObject() OVERRIDE;
 
 private:
-    virtual bool isARIATreeGridRow() const;
+    virtual bool isARIATreeGridRow() const OVERRIDE;
 };
 
 } // namespace WebCore
 
 #endif // AXARIAGridRow_h