[SVG] SVGAnimatedString{,List} migration to new SVG property impl.

Source/core/svg/SVGElement.h

Index: Source/core/svg/SVGElement.h
diff --git a/Source/core/svg/SVGElement.h b/Source/core/svg/SVGElement.h
index 7064ccb3f6ea93de76916b1ec0e3a42d14fbb780..a3617ac43c928eb1e019823f8ab04752832e1b5b 100644
--- a/Source/core/svg/SVGElement.h
+++ b/Source/core/svg/SVGElement.h
@@ -150,8 +150,12 @@ public:
     bool isContextElement() const { return m_isContextElement; }
     void setContextElement() { m_isContextElement = true; }
 
+    void addToPropertyMap(PassRefPtr<NewSVGAnimatedPropertyBase>);
+
     virtual bool childShouldCreateRenderer(const Node& child) const { return true; }
 
+    SVGAnimatedString* className() { return m_className.get(); }
+
 protected:
     SVGElement(const QualifiedName&, Document&, ConstructionType = CreateSVGElement);
 
@@ -205,8 +209,6 @@ protected:
         SVGElement* m_owner;
     };
 
-    void addToPropertyMap(PassRefPtr<NewSVGAnimatedPropertyBase>);
-
 private:
     friend class SVGElementInstance;
 
@@ -231,8 +233,8 @@ private:
 
     typedef HashMap<QualifiedName, RefPtr<NewSVGAnimatedPropertyBase> > AttributeToPropertyMap;
     AttributeToPropertyMap m_newAttributeToPropertyMap;
+    RefPtr<SVGAnimatedString> m_className;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGElement)
-        DECLARE_ANIMATED_STRING(ClassName, className)
     END_DECLARE_ANIMATED_PROPERTIES
 
 #if !ASSERT_DISABLED