Update editing classes to use OVERRIDE / FINAL when needed

Source/core/editing/SplitElementCommand.h

 /*
  * Copyright (C) 2005, 2006, 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
  *    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 SplitElementCommand_h
 #define SplitElementCommand_h
 
 #include "core/editing/EditCommand.h"
 
 namespace WebCore {
 
-class SplitElementCommand : public SimpleEditCommand {
+class SplitElementCommand FINAL : public SimpleEditCommand {
 public:
     static PassRefPtr<SplitElementCommand> create(PassRefPtr<Element> element, PassRefPtr<Node> splitPointChild)
     {
         return adoptRef(new SplitElementCommand(element, splitPointChild));
     }
 
 private:
     SplitElementCommand(PassRefPtr<Element>, PassRefPtr<Node> splitPointChild);
 
     virtual void doApply() OVERRIDE;
     virtual void doUnapply() OVERRIDE;
     virtual void doReapply() OVERRIDE;
     void executeApply();
 
     RefPtr<Element> m_element1;
     RefPtr<Element> m_element2;
     RefPtr<Node> m_atChild;
 };
 
 } // namespace WebCore
 
 #endif // SplitElementCommand_h