Refine toRenderSVGResourceContainer()

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index 6948862db97f83d1a2bb1e78b15593670365dc40..325bdb050e6dcda57008a871543f5247c4aa8ad3 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -981,7 +981,7 @@ void SVGElement::svgAttributeChanged(const QualifiedName& attrName)
         RenderObject* object = renderer();
         // Notify resources about id changes, this is important as we cache resources by id in SVGDocumentExtensions
         if (object && object->isSVGResourceContainer())
-            object->toRenderSVGResourceContainer()->idChanged();
+            toRenderSVGResourceContainer(object)->idChanged();
         if (inDocument())
             buildPendingResourcesIfNeeded();
         SVGElementInstance::invalidateAllInstancesOfElement(this);