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

Source/core/html/parser/HTMLResourcePreloader.h

 /*
  * Copyright (C) 2013 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 24 matching lines @@
 
 namespace blink {
 
 class HTMLResourcePreloader final : public NoBaseWillBeGarbageCollected<HTMLResourcePreloader>, public ResourcePreloader {
     WTF_MAKE_NONCOPYABLE(HTMLResourcePreloader); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(HTMLResourcePreloader);
 public:
     static PassOwnPtrWillBeRawPtr<HTMLResourcePreloader> create(Document&);
     DECLARE_TRACE();
 
 protected:
-    virtual void preload(PassOwnPtr<PreloadRequest>) override;
+    void preload(PassOwnPtr<PreloadRequest>) override;
 
 private:
     explicit HTMLResourcePreloader(Document&);
 
     RawPtrWillBeMember<Document> m_document;
 };
 
 }
 
 #endif