[SVG] SVGAnimatedRect migration to new SVG property impl.

Source/core/svg/SVGViewElement.h

Index: Source/core/svg/SVGViewElement.h
diff --git a/Source/core/svg/SVGViewElement.h b/Source/core/svg/SVGViewElement.h
index 9edc30ec7ea961e8e910fa0e01f9578d59a017b7..36d632d6421cb5b3c1a0f2e4f2dbd3612fd24411 100644
--- a/Source/core/svg/SVGViewElement.h
+++ b/Source/core/svg/SVGViewElement.h
@@ -41,6 +41,8 @@ public:
     using SVGElement::ref;
     using SVGElement::deref;
 
+    SVGAnimatedRect* viewBox() { return m_viewBox.get(); }
+
     SVGStringList& viewTarget() { return m_viewTarget; }
     SVGZoomAndPanType zoomAndPan() const { return m_zoomAndPan; }
     void setZoomAndPan(unsigned short zoomAndPan) { m_zoomAndPan = SVGZoomAndPan::parseFromNumber(zoomAndPan); }
@@ -54,8 +56,8 @@ private:
 
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
 
+    RefPtr<SVGAnimatedRect> m_viewBox;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGViewElement)
-        DECLARE_ANIMATED_RECT(ViewBox, viewBox)
         DECLARE_ANIMATED_PRESERVEASPECTRATIO(PreserveAspectRatio, preserveAspectRatio)
     END_DECLARE_ANIMATED_PROPERTIES