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

Source/core/svg/SVGBoolean.h

Index: Source/core/svg/SVGBoolean.h
diff --git a/Source/core/svg/SVGBoolean.h b/Source/core/svg/SVGBoolean.h
index 39b64ea17487b752d0689c382689eeb8d69c9dfc..7d2592eeeef03a9cbf44b8509eb99d37704ee511 100644
--- a/Source/core/svg/SVGBoolean.h
+++ b/Source/core/svg/SVGBoolean.h
@@ -48,12 +48,12 @@ public:
 
     PassRefPtrWillBeRawPtr<SVGBoolean> clone() const { return create(m_value); }
 
-    virtual String valueAsString() const override;
+    String valueAsString() const override;
     void setValueAsString(const String&, ExceptionState&);
 
-    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;
 
     bool value() const { return m_value; }
     void setValue(bool value) { m_value = value; }