Make SVGTextPositioningElement::elementFromRenderer take a reference

Source/core/svg/SVGTextPositioningElement.cpp

Index: Source/core/svg/SVGTextPositioningElement.cpp
diff --git a/Source/core/svg/SVGTextPositioningElement.cpp b/Source/core/svg/SVGTextPositioningElement.cpp
index 32b6e3b3cd3f7754df48ae5762f0c16d5e0ec383..99b3aa37388d2abcfd935603b925e9c800812401 100644
--- a/Source/core/svg/SVGTextPositioningElement.cpp
+++ b/Source/core/svg/SVGTextPositioningElement.cpp
@@ -90,15 +90,12 @@ void SVGTextPositioningElement::svgAttributeChanged(const QualifiedName& attrNam
     markForLayoutAndParentResourceInvalidation(renderer);
 }
 
-SVGTextPositioningElement* SVGTextPositioningElement::elementFromRenderer(RenderObject* renderer)
+SVGTextPositioningElement* SVGTextPositioningElement::elementFromRenderer(RenderObject& renderer)
 {
-    if (!renderer)
-        return 0;
-
-    if (!renderer->isSVGText() && !renderer->isSVGInline())
+    if (!renderer.isSVGText() && !renderer.isSVGInline())
         return 0;
 
-    Node* node = renderer->node();
+    Node* node = renderer.node();
     ASSERT(node);
     ASSERT(node->isSVGElement());