Update editing classes to use OVERRIDE / FINAL when needed

Source/core/editing/SplitTextNodeCommand.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 14 matching lines @@
 
 #ifndef SplitTextNodeCommand_h
 #define SplitTextNodeCommand_h
 
 #include "core/editing/EditCommand.h"
 
 namespace WebCore {
 
 class Text;
 
-class SplitTextNodeCommand : public SimpleEditCommand {
+class SplitTextNodeCommand FINAL : public SimpleEditCommand {
 public:
     static PassRefPtr<SplitTextNodeCommand> create(PassRefPtr<Text> node, int offset)
     {
         return adoptRef(new SplitTextNodeCommand(node, offset));
     }
 
 private:
     SplitTextNodeCommand(PassRefPtr<Text>, int offset);
 
     virtual void doApply() OVERRIDE;
     virtual void doUnapply() OVERRIDE;
     virtual void doReapply() OVERRIDE;
     void insertText1AndTrimText2();
 
     RefPtr<Text> m_text1;
     RefPtr<Text> m_text2;
     unsigned m_offset;
 };
 
 } // namespace WebCore
 
 #endif // SplitTextNodeCommand_h