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

Source/core/svg/SVGCircleElement.h

Index: Source/core/svg/SVGCircleElement.h
diff --git a/Source/core/svg/SVGCircleElement.h b/Source/core/svg/SVGCircleElement.h
index eb689f8d31de6aa8ac41236735bd40703833aaf0..c56ba98f18eee97b296ce4dbcd8b13e6d2c8c1b3 100644
--- a/Source/core/svg/SVGCircleElement.h
+++ b/Source/core/svg/SVGCircleElement.h
@@ -34,6 +34,10 @@ class SVGCircleElement FINAL : public SVGGeometryElement,
 public:
     static PassRefPtr<SVGCircleElement> create(Document&);
 
+    SVGAnimatedLength* cx() const { return m_cx.get(); }
+    SVGAnimatedLength* cy() const { return m_cy.get(); }
+    SVGAnimatedLength* r() const { return m_r.get(); }
+
 private:
     explicit SVGCircleElement(Document&);
 
@@ -48,10 +52,10 @@ private:
 
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
 
+    RefPtr<SVGAnimatedLength> m_cx;
+    RefPtr<SVGAnimatedLength> m_cy;
+    RefPtr<SVGAnimatedLength> m_r;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGCircleElement)
-        DECLARE_ANIMATED_LENGTH(Cx, cx)
-        DECLARE_ANIMATED_LENGTH(Cy, cy)
-        DECLARE_ANIMATED_LENGTH(R, r)
         DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
     END_DECLARE_ANIMATED_PROPERTIES
 };