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

Source/core/layout/LayoutSlider.h

 /*
  * Copyright (C) 2006, 2007, 2008, 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 15 matching lines @@
 namespace blink {
 
 class HTMLInputElement;
 class SliderThumbElement;
 
 class LayoutSlider final : public LayoutFlexibleBox {
 public:
     static const int defaultTrackLength;
 
     explicit LayoutSlider(HTMLInputElement*);
-    virtual ~LayoutSlider();
+    ~LayoutSlider() override;
 
     bool inDragMode() const;
 
-    virtual const char* name() const override { return "LayoutSlider"; }
+    const char* name() const override { return "LayoutSlider"; }
 
 private:
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectSlider || LayoutFlexibleBox::isOfType(type); }
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectSlider || LayoutFlexibleBox::isOfType(type); }
 
-    virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
-    virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
-    virtual void layout() override;
+    int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
+    void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
+    void layout() override;
 
     SliderThumbElement* sliderThumbElement() const;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSlider, isSlider());
 
 } // namespace blink
 
 #endif // LayoutSlider_h