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

Source/core/editing/TextInsertionBaseCommand.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 18 matching lines @@
 #include "core/editing/CompositeEditCommand.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class Document;
 class VisibleSelection;
 
 class TextInsertionBaseCommand : public CompositeEditCommand {
 public:
-    virtual ~TextInsertionBaseCommand() { };
+    ~TextInsertionBaseCommand() override { };
 
 protected:
     explicit TextInsertionBaseCommand(Document&);
     static void applyTextInsertionCommand(LocalFrame*, PassRefPtrWillBeRawPtr<TextInsertionBaseCommand>, const VisibleSelection& selectionForInsertion, const VisibleSelection& endingSelection);
 };
 
 String dispatchBeforeTextInsertedEvent(const String& text, const VisibleSelection& selectionForInsertion, bool insertionIsForUpdatingComposition);
 bool canAppendNewLineFeedToSelection(const VisibleSelection&);
 
 // LineOperation should define member function "opeartor (size_t lineOffset, size_t lineLength, bool isLastLine)".
@@ skipping 12 matching lines @@
     else {
         unsigned length = string.length();
         if (length != offset)
             operation(offset, length - offset, true);
     }
 }
 
 }
 
 #endif