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

Source/core/svg/SVGString.h

Index: Source/core/svg/SVGString.h
diff --git a/Source/core/svg/SVGString.h b/Source/core/svg/SVGString.h
index 5d2a0d8461e5036dac92c07fc15e639a69473336..f17b0175fe60f58399679c774c1906cce8094dad 100644
--- a/Source/core/svg/SVGString.h
+++ b/Source/core/svg/SVGString.h
@@ -54,17 +54,17 @@ public:
     }
 
     PassRefPtrWillBeRawPtr<SVGString> clone() const { return create(m_value); }
-    virtual PassRefPtrWillBeRawPtr<SVGPropertyBase> cloneForAnimation(const String& value) const override
+    PassRefPtrWillBeRawPtr<SVGPropertyBase> cloneForAnimation(const String& value) const override
     {
         return create(value);
     }
 
-    virtual String valueAsString() const override { return m_value; }
+    String valueAsString() const override { return m_value; }
     void setValueAsString(const String& value, ExceptionState&) { m_value = value; }
 
-    virtual void add(PassRefPtrWillBeRawPtr<SVGPropertyBase>, SVGElement*) override;
-    virtual void calculateAnimatedValue(SVGAnimationElement*, float percentage, unsigned repeatCount, PassRefPtrWillBeRawPtr<SVGPropertyBase> from, PassRefPtrWillBeRawPtr<SVGPropertyBase> to, PassRefPtrWillBeRawPtr<SVGPropertyBase> toAtEndOfDurationValue, SVGElement*) override;
-    virtual float calculateDistance(PassRefPtrWillBeRawPtr<SVGPropertyBase> to, SVGElement*) override;
+    void add(PassRefPtrWillBeRawPtr<SVGPropertyBase>, SVGElement*) override;
+    void calculateAnimatedValue(SVGAnimationElement*, float percentage, unsigned repeatCount, PassRefPtrWillBeRawPtr<SVGPropertyBase> from, PassRefPtrWillBeRawPtr<SVGPropertyBase> to, PassRefPtrWillBeRawPtr<SVGPropertyBase> toAtEndOfDurationValue, SVGElement*) override;
+    float calculateDistance(PassRefPtrWillBeRawPtr<SVGPropertyBase> to, SVGElement*) override;
 
     const String& value() const { return m_value; }
     void setValue(const String& value) { m_value = value; }