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

Source/core/svg/SVGMarkerElement.h

Index: Source/core/svg/SVGMarkerElement.h
diff --git a/Source/core/svg/SVGMarkerElement.h b/Source/core/svg/SVGMarkerElement.h
index bea0de0a315a3c4254710dda00e2eeb718a5dc7c..a713ae645ba19110c5ee975d7a7667dd0970786f 100644
--- a/Source/core/svg/SVGMarkerElement.h
+++ b/Source/core/svg/SVGMarkerElement.h
@@ -77,15 +77,15 @@ public:
 private:
     explicit SVGMarkerElement(Document&);
 
-    virtual bool needsPendingResourceHandling() const override { return false; }
+    bool needsPendingResourceHandling() const override { return false; }
 
-    virtual void svgAttributeChanged(const QualifiedName&) override;
-    virtual void childrenChanged(const ChildrenChange&) override;
+    void svgAttributeChanged(const QualifiedName&) override;
+    void childrenChanged(const ChildrenChange&) override;
 
-    virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
-    virtual bool layoutObjectIsNeeded(const ComputedStyle&) override { return true; }
+    LayoutObject* createLayoutObject(const ComputedStyle&) override;
+    bool layoutObjectIsNeeded(const ComputedStyle&) override { return true; }
 
-    virtual bool selfHasRelativeLengths() const override;
+    bool selfHasRelativeLengths() const override;
 
     RefPtrWillBeMember<SVGAnimatedLength> m_refX;
     RefPtrWillBeMember<SVGAnimatedLength> m_refY;