Fix virtual/override/final usage in Source/core/editing/.

Source/core/editing/InsertTextCommand.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 28 matching lines @@
 
     static PassRefPtrWillBeRawPtr<InsertTextCommand> create(Document& document, const String& text, bool selectInsertedText = false,
         RebalanceType rebalanceType = RebalanceLeadingAndTrailingWhitespaces)
     {
         return adoptRefWillBeNoop(new InsertTextCommand(document, text, selectInsertedText, rebalanceType));
     }
 
 private:
     InsertTextCommand(Document&, const String& text, bool selectInsertedText, RebalanceType);
 
-    virtual void doApply() override;
+    void doApply() override;
 
     Position positionInsideTextNode(const Position&);
     Position insertTab(const Position&);
 
     bool performTrivialReplace(const String&, bool selectInsertedText);
     bool performOverwrite(const String&, bool selectInsertedText);
     void setEndingSelectionWithoutValidation(const Position& startPosition, const Position& endPosition);
 
     friend class TypingCommand;
 
     String m_text;
     bool m_selectInsertedText;
     RebalanceType m_rebalanceType;
 };
 
 } // namespace blink
 
 #endif // InsertTextCommand_h