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

Source/core/layout/LayoutListBox.h

Index: Source/core/layout/LayoutListBox.h
diff --git a/Source/core/layout/LayoutListBox.h b/Source/core/layout/LayoutListBox.h
index 93bc71bbb2b5843c696031a628bee6cb1f8af1e6..804b3f26bd941b151d89e121c42ea894211f4069 100644
--- a/Source/core/layout/LayoutListBox.h
+++ b/Source/core/layout/LayoutListBox.h
@@ -40,24 +40,24 @@ class HTMLSelectElement;
 class LayoutListBox final : public LayoutBlockFlow {
 public:
     explicit LayoutListBox(Element*);
-    virtual ~LayoutListBox();
+    ~LayoutListBox() override;
 
     unsigned size() const;
 
     // Unlike scrollRectToVisible this will not scroll parent boxes.
     void scrollToRect(const LayoutRect&);
 
-    virtual const char* name() const override { return "LayoutListBox"; }
+    const char* name() const override { return "LayoutListBox"; }
 
 private:
     HTMLSelectElement* selectElement() const;
 
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectListBox || LayoutBlockFlow::isOfType(type); }
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectListBox || LayoutBlockFlow::isOfType(type); }
 
-    virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
-    virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
+    void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
+    void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
 
-    virtual void stopAutoscroll() override;
+    void stopAutoscroll() override;
 
     LayoutUnit defaultItemHeight() const;
     LayoutUnit itemHeight() const;