Have NodeTraversal::nextSkippingChildren() take a reference

Source/core/html/HTMLFieldSetElement.cpp

Index: Source/core/html/HTMLFieldSetElement.cpp
diff --git a/Source/core/html/HTMLFieldSetElement.cpp b/Source/core/html/HTMLFieldSetElement.cpp
index 7973ee6a5a1099ef05b64eef4a7689cc9939bfb2..130d800e40d4883bb9d5bc6ba3209b4f3c2a3c5b 100644
--- a/Source/core/html/HTMLFieldSetElement.cpp
+++ b/Source/core/html/HTMLFieldSetElement.cpp
@@ -67,7 +67,7 @@ void HTMLFieldSetElement::disabledAttributeChanged()
 void HTMLFieldSetElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     HTMLFormControlElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
-    for (Element* element = ElementTraversal::firstWithin(this); element; element = ElementTraversal::nextSkippingChildren(element, this)) {
+    for (Element* element = ElementTraversal::firstWithin(this); element; element = ElementTraversal::nextSkippingChildren(*element, this)) {
         if (element->hasTagName(legendTag))
             invalidateDisabledStateUnder(element);
     }
@@ -91,7 +91,7 @@ RenderObject* HTMLFieldSetElement::createRenderer(RenderStyle*)
 
 HTMLLegendElement* HTMLFieldSetElement::legend() const
 {
-    for (Element* child = ElementTraversal::firstWithin(this); child; child = ElementTraversal::nextSkippingChildren(child, this)) {
+    for (Element* child = ElementTraversal::firstWithin(this); child; child = ElementTraversal::nextSkippingChildren(*child, this)) {
         if (child->hasTagName(legendTag))
             return toHTMLLegendElement(child);
     }