Have ElementTraversal / NodeTraversal's next() methods take a reference

Source/core/svg/SVGUseElement.cpp

Index: Source/core/svg/SVGUseElement.cpp
diff --git a/Source/core/svg/SVGUseElement.cpp b/Source/core/svg/SVGUseElement.cpp
index 92f95a34354ae70bba5aed38542282aa24dea7c1..36d700dad26e542180852e2c197659ff1e44ccdd 100644
--- a/Source/core/svg/SVGUseElement.cpp
+++ b/Source/core/svg/SVGUseElement.cpp
@@ -677,8 +677,9 @@ static inline void removeDisallowedElementsFromSubtree(Element* subtree)
             // The subtree is not in document so this won't generate events that could mutate the tree.
             element->parentNode()->removeChild(element);
             element = next;
-        } else
-            element = ElementTraversal::next(element, subtree);
+        } else {
+            element = ElementTraversal::next(*element, subtree);
+        }
     }
 }