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

Source/core/layout/LayoutFieldset.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 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.
@@ skipping 16 matching lines @@
 #include "core/layout/LayoutBlockFlow.h"
 
 namespace blink {
 
 class LayoutFieldset final : public LayoutBlockFlow {
 public:
     explicit LayoutFieldset(Element*);
 
     LayoutBox* findInFlowLegend() const;
 
-    virtual const char* name() const override { return "LayoutFieldset"; }
+    const char* name() const override { return "LayoutFieldset"; }
 
 private:
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectFieldset || LayoutBlockFlow::isOfType(type); }
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectFieldset || LayoutBlockFlow::isOfType(type); }
 
-    virtual LayoutObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&) override;
+    LayoutObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&) override;
 
-    virtual void computePreferredLogicalWidths() override;
-    virtual bool avoidsFloats() const override { return true; }
+    void computePreferredLogicalWidths() override;
+    bool avoidsFloats() const override { return true; }
 
-    virtual void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&) override;
-    virtual void paintMask(const PaintInfo&, const LayoutPoint&) override;
+    void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&) override;
+    void paintMask(const PaintInfo&, const LayoutPoint&) override;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutFieldset, isFieldset());
 
 } // namespace blink
 
 #endif // LayoutFieldset_h