Update editing classes to use OVERRIDE / FINAL when needed

Source/core/editing/SetSelectionCommand.h

 /*
  * Copyright (C) 2011 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 13 matching lines @@
  */
 
 #ifndef SetSelectionCommand_h
 #define SetSelectionCommand_h
 
 #include "core/editing/EditCommand.h"
 #include "core/editing/FrameSelection.h"
 
 namespace WebCore {
 
-class SetSelectionCommand : public SimpleEditCommand {
+class SetSelectionCommand FINAL : public SimpleEditCommand {
 public:
     static PassRefPtr<SetSelectionCommand> create(const VisibleSelection& selection, FrameSelection::SetSelectionOptions options)
     {
         return adoptRef(new SetSelectionCommand(selection, options));
     }
 
 private:
     SetSelectionCommand(const VisibleSelection&, FrameSelection::SetSelectionOptions);
 
     virtual void doApply() OVERRIDE;
     virtual void doUnapply() OVERRIDE;
 
     FrameSelection::SetSelectionOptions m_options;
     VisibleSelection m_selectionToSet;
 };
 
 } // namespace WebCore
 
 #endif // SetSelectionCommand_h