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

Source/core/svg/SVGTextPathElement.h

Index: Source/core/svg/SVGTextPathElement.h
diff --git a/Source/core/svg/SVGTextPathElement.h b/Source/core/svg/SVGTextPathElement.h
index b7ba83392273e985899b6e170e44d8d8e4b6e3e9..84f4e99251d0c2a76b9736cc6c5b0dc2aa8a50f7 100644
--- a/Source/core/svg/SVGTextPathElement.h
+++ b/Source/core/svg/SVGTextPathElement.h
@@ -112,6 +112,7 @@ public:
     static PassRefPtr<SVGTextPathElement> create(Document&);
 
     SVGAnimatedLength* startOffset() const { return m_startOffset.get(); }
+    SVGAnimatedString* href() { return m_href.get(); }
 
 private:
     explicit SVGTextPathElement(Document&);
@@ -135,10 +136,10 @@ private:
     virtual bool selfHasRelativeLengths() const OVERRIDE;
 
     RefPtr<SVGAnimatedLength> m_startOffset;
+    RefPtr<SVGAnimatedString> m_href;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGTextPathElement)
         DECLARE_ANIMATED_ENUMERATION(Method, method, SVGTextPathMethodType)
         DECLARE_ANIMATED_ENUMERATION(Spacing, spacing, SVGTextPathSpacingType)
-        DECLARE_ANIMATED_STRING(Href, href)
     END_DECLARE_ANIMATED_PROPERTIES
 };