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

Source/core/svg/SVGAnimatedIntegerOptionalInteger.h

Index: Source/core/svg/SVGAnimatedIntegerOptionalInteger.h
diff --git a/Source/core/svg/SVGAnimatedIntegerOptionalInteger.h b/Source/core/svg/SVGAnimatedIntegerOptionalInteger.h
index 6503b6d1ca27ec889958f23739f550c2a9a12722..246d2186d2f1d7da88a70499c4839705784711c9 100644
--- a/Source/core/svg/SVGAnimatedIntegerOptionalInteger.h
+++ b/Source/core/svg/SVGAnimatedIntegerOptionalInteger.h
@@ -49,9 +49,9 @@ public:
         return adoptRefWillBeNoop(new SVGAnimatedIntegerOptionalInteger(contextElement, attributeName, initialFirstValue, initialSecondValue));
     }
 
-    virtual void setAnimatedValue(PassRefPtrWillBeRawPtr<SVGPropertyBase>) override;
-    virtual bool needsSynchronizeAttribute() override;
-    virtual void animationEnded() override;
+    void setAnimatedValue(PassRefPtrWillBeRawPtr<SVGPropertyBase>) override;
+    bool needsSynchronizeAttribute() override;
+    void animationEnded() override;
 
     SVGAnimatedInteger* firstInteger() { return m_firstInteger.get(); }
     SVGAnimatedInteger* secondInteger() { return m_secondInteger.get(); }