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

Source/core/svg/SVGCursorElement.h

Index: Source/core/svg/SVGCursorElement.h
diff --git a/Source/core/svg/SVGCursorElement.h b/Source/core/svg/SVGCursorElement.h
index 367b3f7b8ecc5bfdc213c6dce85e69c9e351eced..546af6ef1085623b8b8044f1976822f4a4cbd6d0 100644
--- a/Source/core/svg/SVGCursorElement.h
+++ b/Source/core/svg/SVGCursorElement.h
@@ -38,7 +38,7 @@ class SVGCursorElement final : public SVGElement,
 public:
     DECLARE_NODE_FACTORY(SVGCursorElement);
 
-    virtual ~SVGCursorElement();
+    ~SVGCursorElement() override;
 
     void addClient(SVGElement*);
 #if !ENABLE(OILPAN)
@@ -54,11 +54,11 @@ public:
 private:
     explicit SVGCursorElement(Document&);
 
-    virtual bool isValid() const override { return SVGTests::isValid(document()); }
+    bool isValid() const override { return SVGTests::isValid(document()); }
 
-    virtual void svgAttributeChanged(const QualifiedName&) override;
+    void svgAttributeChanged(const QualifiedName&) override;
 
-    virtual bool layoutObjectIsNeeded(const ComputedStyle&) override { return false; }
+    bool layoutObjectIsNeeded(const ComputedStyle&) override { return false; }
 
     RefPtrWillBeMember<SVGAnimatedLength> m_x;
     RefPtrWillBeMember<SVGAnimatedLength> m_y;