[SVG] SVGAnimatedRect migration to new SVG property impl.

Source/core/svg/SVGPatternElement.h

Index: Source/core/svg/SVGPatternElement.h
diff --git a/Source/core/svg/SVGPatternElement.h b/Source/core/svg/SVGPatternElement.h
index 24823470aaf917d167b1685d2983247ed7296836..27f2652970502ca6e73eeed2a45e6fed8221ba7f 100644
--- a/Source/core/svg/SVGPatternElement.h
+++ b/Source/core/svg/SVGPatternElement.h
@@ -53,6 +53,7 @@ public:
     SVGAnimatedLength* y() const { return m_y.get(); }
     SVGAnimatedLength* width() const { return m_width.get(); }
     SVGAnimatedLength* height() const { return m_height.get(); }
+    SVGAnimatedRect* viewBox() const { return m_viewBox.get(); }
 
 private:
     explicit SVGPatternElement(Document&);
@@ -73,12 +74,12 @@ private:
     RefPtr<SVGAnimatedLength> m_y;
     RefPtr<SVGAnimatedLength> m_width;
     RefPtr<SVGAnimatedLength> m_height;
+    RefPtr<SVGAnimatedRect> m_viewBox;
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGPatternElement)
         DECLARE_ANIMATED_ENUMERATION(PatternUnits, patternUnits, SVGUnitTypes::SVGUnitType)
         DECLARE_ANIMATED_ENUMERATION(PatternContentUnits, patternContentUnits, SVGUnitTypes::SVGUnitType)
         DECLARE_ANIMATED_TRANSFORM_LIST(PatternTransform, patternTransform)
         DECLARE_ANIMATED_STRING(Href, href)
-        DECLARE_ANIMATED_RECT(ViewBox, viewBox)
         DECLARE_ANIMATED_PRESERVEASPECTRATIO(PreserveAspectRatio, preserveAspectRatio)
     END_DECLARE_ANIMATED_PROPERTIES