Use DEFINE_NODE_TYPE_CASTS instead of using manual toSVGFooElement()

Source/core/svg/SVGFilterElement.h

Index: Source/core/svg/SVGFilterElement.h
diff --git a/Source/core/svg/SVGFilterElement.h b/Source/core/svg/SVGFilterElement.h
index d344fd280b29ada19bb81473be8d709b0699682d..f929a3e0b2e9fec3d87a703ef4dde1f16b5c56cb 100644
--- a/Source/core/svg/SVGFilterElement.h
+++ b/Source/core/svg/SVGFilterElement.h
@@ -79,11 +79,7 @@ private:
     HashSet<RefPtr<Node> > m_clientsToAdd;
 };
 
-inline SVGFilterElement* toSVGFilterElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::filterTag));
-    return static_cast<SVGFilterElement*>(node);
-}
+DEFINE_NODE_TYPE_CASTS(SVGFilterElement, hasTagName(SVGNames::filterTag));
 
 }