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

Source/core/html/HTMLViewSourceDocument.h

 /*
  * Copyright (C) 2006, 2008, 2009 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 34 matching lines @@
         return adoptRefWillBeNoop(new HTMLViewSourceDocument(initializer, mimeType));
     }
 
     void addSource(const String&, HTMLToken&, SourceAnnotation);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     HTMLViewSourceDocument(const DocumentInit&, const String& mimeType);
 
-    virtual PassRefPtrWillBeRawPtr<DocumentParser> createParser() override;
+    PassRefPtrWillBeRawPtr<DocumentParser> createParser() override;
 
     void processDoctypeToken(const String& source, HTMLToken&);
     void processEndOfFileToken(const String& source, HTMLToken&);
     void processTagToken(const String& source, HTMLToken&, SourceAnnotation);
     void processCommentToken(const String& source, HTMLToken&);
     void processCharacterToken(const String& source, HTMLToken&, SourceAnnotation);
 
     void createContainingTable();
     PassRefPtrWillBeRawPtr<Element> addSpanWithClassName(const AtomicString&);
     void addLine(const AtomicString& className);
     void finishLine();
     void addText(const String& text, const AtomicString& className, SourceAnnotation = AnnotateSourceAsSafe);
     int addRange(const String& source, int start, int end, const AtomicString& className, bool isLink = false, bool isAnchor = false, const AtomicString& link = nullAtom);
     void maybeAddSpanForAnnotation(SourceAnnotation);
 
     PassRefPtrWillBeRawPtr<Element> addLink(const AtomicString& url, bool isAnchor);
     PassRefPtrWillBeRawPtr<Element> addBase(const AtomicString& href);
 
     String m_type;
     RefPtrWillBeMember<Element> m_current;
     RefPtrWillBeMember<HTMLTableSectionElement> m_tbody;
     RefPtrWillBeMember<HTMLTableCellElement> m_td;
     int m_lineNumber;
 };
 
 }
 
 #endif // HTMLViewSourceDocument_h