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

Source/core/layout/LayoutApplet.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 13 matching lines @@
 
 #include "core/layout/LayoutEmbeddedObject.h"
 
 namespace blink {
 
 class HTMLAppletElement;
 
 class LayoutApplet final : public LayoutEmbeddedObject {
 public:
     explicit LayoutApplet(HTMLAppletElement*);
-    virtual ~LayoutApplet();
+    ~LayoutApplet() override;
 
-    virtual const char* name() const override { return "LayoutApplet"; }
+    const char* name() const override { return "LayoutApplet"; }
 };
 
 } // namespace blink
 
 #endif // LayoutApplet_h