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

Source/core/html/parser/TextDocumentParser.h

 /*
  * Copyright (C) 2010 Google 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/html/parser/HTMLDocumentParser.h"
 
 namespace blink {
 
 class TextDocumentParser final : public HTMLDocumentParser {
 public:
     static PassRefPtrWillBeRawPtr<TextDocumentParser> create(HTMLDocument& document, ParserSynchronizationPolicy syncPolicy)
     {
         return adoptRefWillBeNoop(new TextDocumentParser(document, syncPolicy));
     }
-    virtual ~TextDocumentParser();
+    ~TextDocumentParser() override;
 
 private:
     explicit TextDocumentParser(HTMLDocument&, ParserSynchronizationPolicy);
 
-    virtual void appendBytes(const char*, size_t) override;
+    void appendBytes(const char*, size_t) override;
     void insertFakePreElement();
 
     bool m_haveInsertedFakePreElement;
 };
 
 }
 
 #endif