Generate toSVGGradient|Graphics|PolyElement()

Source/core/svg/SVGGraphicsElement.h

Index: Source/core/svg/SVGGraphicsElement.h
diff --git a/Source/core/svg/SVGGraphicsElement.h b/Source/core/svg/SVGGraphicsElement.h
index 319033496f5e5543bac763b7dc43580dcad2fac4..6bc8830c32f3359ff0b9c98b0f95621ad43291f3 100644
--- a/Source/core/svg/SVGGraphicsElement.h
+++ b/Source/core/svg/SVGGraphicsElement.h
@@ -76,13 +76,13 @@ private:
     OwnPtr<AffineTransform> m_supplementalTransform;
 };
 
-inline SVGGraphicsElement* toSVGGraphicsElement(Node* node)
+inline bool isSVGGraphicsElement(const Node& node)
 {
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isSVGElement());
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || toSVGElement(node)->isSVGGraphicsElement());
-    return static_cast<SVGGraphicsElement*>(node);
+    return node.isSVGElement() && toSVGElement(node).isSVGGraphicsElement();
 }
 
+DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(SVGGraphicsElement);
+
 } // namespace WebCore
 
 #endif // SVGGraphicsElement_h