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

Source/core/html/HTMLLegendElement.cpp

Index: Source/core/html/HTMLLegendElement.cpp
diff --git a/Source/core/html/HTMLLegendElement.cpp b/Source/core/html/HTMLLegendElement.cpp
index 515932622ead34d0dcf065c1f2abef1ba0e1fe73..0114eb5e057fd8f0f6f8d6d8b25d9d0df3fa8511 100644
--- a/Source/core/html/HTMLLegendElement.cpp
+++ b/Source/core/html/HTMLLegendElement.cpp
@@ -59,7 +59,7 @@ HTMLFormControlElement* HTMLLegendElement::associatedControl()
     // Find first form element inside the fieldset that is not a legend element.
     // FIXME: Should we consider tabindex?
     Element* element = fieldset;
-    while ((element = ElementTraversal::next(element, fieldset))) {
+    while ((element = ElementTraversal::next(*element, fieldset))) {
         if (element->isFormControlElement())
             return toHTMLFormControlElement(element);
     }