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

Source/core/dom/shadow/ElementShadow.cpp

Index: Source/core/dom/shadow/ElementShadow.cpp
diff --git a/Source/core/dom/shadow/ElementShadow.cpp b/Source/core/dom/shadow/ElementShadow.cpp
index 82d678c183e5655a29a8dcb22bcb27266043ac21..97bdec59e5d63c8c7f168a4d6ffa00463d6c03a0 100644
--- a/Source/core/dom/shadow/ElementShadow.cpp
+++ b/Source/core/dom/shadow/ElementShadow.cpp
@@ -203,7 +203,7 @@ void ElementShadow::detach(const Node::AttachContext& context)
 void ElementShadow::removeAllEventListeners()
 {
     for (ShadowRoot* root = youngestShadowRoot(); root; root = root->olderShadowRoot()) {
-        for (Node* node = root; node; node = NodeTraversal::next(node))
+        for (Node* node = root; node; node = NodeTraversal::next(*node))
             node->removeAllEventListeners();
     }
 }
@@ -341,7 +341,7 @@ void ElementShadow::collectSelectFeatureSetFrom(ShadowRoot* root)
     if (!root->containsShadowRoots() && !root->containsContentElements())
         return;
 
-    for (Element* element = ElementTraversal::firstWithin(root); element; element = ElementTraversal::next(element, root)) {
+    for (Element* element = ElementTraversal::firstWithin(root); element; element = ElementTraversal::next(*element, root)) {
         if (ElementShadow* shadow = element->shadow())
             m_selectFeatures.add(shadow->ensureSelectFeatureSet());
         if (!isHTMLContentElement(element))