Update editing classes to use OVERRIDE / FINAL when needed

Source/core/editing/SimplifyMarkupCommand.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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef SimplifyMarkupCommand_h
 #define SimplifyMarkupCommand_h
 
 #include "core/editing/CompositeEditCommand.h"
 
 namespace WebCore {
 
-class SimplifyMarkupCommand : public CompositeEditCommand {
+class SimplifyMarkupCommand FINAL : public CompositeEditCommand {
 public:
     static PassRefPtr<SimplifyMarkupCommand> create(Document& document, Node* firstNode, Node* nodeAfterLast)
     {
         return adoptRef(new SimplifyMarkupCommand(document, firstNode, nodeAfterLast));
     }
 
 private:
     SimplifyMarkupCommand(Document&, Node* firstNode, Node* nodeAfterLast);
 
-    virtual void doApply();
+    virtual void doApply() OVERRIDE;
     int pruneSubsequentAncestorsToRemove(Vector<RefPtr<Node> >& nodesToRemove, size_t startNodeIndex);
 
     RefPtr<Node> m_firstNode;
     RefPtr<Node> m_nodeAfterLast;
 };
 
 } // namespace WebCore
 
 #endif // SimplifyMarkupCommand_h