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

Source/core/layout/LayoutDetailsMarker.h

Index: Source/core/layout/LayoutDetailsMarker.h
diff --git a/Source/core/layout/LayoutDetailsMarker.h b/Source/core/layout/LayoutDetailsMarker.h
index c1609307f3b5954ad9f257051b4894dabf5b4327..936fd44e62e42cbb0886e46236a4663a231068ec 100644
--- a/Source/core/layout/LayoutDetailsMarker.h
+++ b/Source/core/layout/LayoutDetailsMarker.h
@@ -33,11 +33,11 @@ public:
 
     Orientation orientation() const;
 
-    virtual const char* name() const override { return "LayoutDetailsMarker"; }
+    const char* name() const override { return "LayoutDetailsMarker"; }
 
 private:
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectDetailsMarker || LayoutBlockFlow::isOfType(type); }
-    virtual void paint(const PaintInfo&, const LayoutPoint&) override;
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectDetailsMarker || LayoutBlockFlow::isOfType(type); }
+    void paint(const PaintInfo&, const LayoutPoint&) override;
 
     bool isOpen() const;
 };