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

Source/core/svg/SVGFEImageElement.h

Index: Source/core/svg/SVGFEImageElement.h
diff --git a/Source/core/svg/SVGFEImageElement.h b/Source/core/svg/SVGFEImageElement.h
index 36e4c20ec68eff29b8c3333098f3d3bed2465ab4..86982238a09ac11f59e5fcc94b69d0816c60e742 100644
--- a/Source/core/svg/SVGFEImageElement.h
+++ b/Source/core/svg/SVGFEImageElement.h
@@ -43,6 +43,7 @@ public:
 
     virtual ~SVGFEImageElement();
     SVGAnimatedPreserveAspectRatio* preserveAspectRatio() { return m_preserveAspectRatio.get(); }
+    SVGAnimatedString* href() { return m_href.get(); }
 
 private:
     explicit SVGFEImageElement(Document&);
@@ -62,8 +63,8 @@ private:
     virtual void removedFrom(ContainerNode*) OVERRIDE;
 
     RefPtr<SVGAnimatedPreserveAspectRatio> m_preserveAspectRatio;
+    RefPtr<SVGAnimatedString> m_href;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGFEImageElement)
-        DECLARE_ANIMATED_STRING(Href, href)
     END_DECLARE_ANIMATED_PROPERTIES
 
     ResourcePtr<ImageResource> m_cachedImage;