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

Source/core/layout/shapes/PolygonShape.h

Index: Source/core/layout/shapes/PolygonShape.h
diff --git a/Source/core/layout/shapes/PolygonShape.h b/Source/core/layout/shapes/PolygonShape.h
index 1ad286b1fa947470e8f86815b72a30e160958245..9c9036b3b1d7ae7dcb1fe28423b63acc507ea723 100644
--- a/Source/core/layout/shapes/PolygonShape.h
+++ b/Source/core/layout/shapes/PolygonShape.h
@@ -44,8 +44,8 @@ public:
     {
     }
 
-    virtual const FloatPoint& vertex1() const override { return m_vertex1; }
-    virtual const FloatPoint& vertex2() const override { return m_vertex2; }
+    const FloatPoint& vertex1() const override { return m_vertex1; }
+    const FloatPoint& vertex2() const override { return m_vertex2; }
 
     bool isWithinYRange(float y1, float y2) const { return y1 <= minY() && y2 >= maxY(); }
     bool overlapsYRange(float y1, float y2) const { return y2 >= minY() && y1 <= maxY(); }
@@ -66,10 +66,10 @@ public:
     {
     }
 
-    virtual LayoutRect shapeMarginLogicalBoundingBox() const override;
-    virtual bool isEmpty() const override { return m_polygon.isEmpty(); }
-    virtual LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const override;
-    virtual void buildDisplayPaths(DisplayPaths&) const override;
+    LayoutRect shapeMarginLogicalBoundingBox() const override;
+    bool isEmpty() const override { return m_polygon.isEmpty(); }
+    LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const override;
+    void buildDisplayPaths(DisplayPaths&) const override;
 
 private:
     FloatPolygon m_polygon;