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

Source/core/dom/ContainerNode.cpp

Index: Source/core/dom/ContainerNode.cpp
diff --git a/Source/core/dom/ContainerNode.cpp b/Source/core/dom/ContainerNode.cpp
index 3dc0a353a60fe43f858b0ebee5f3ee75a51792db..a99e3ead98203804622b4b987576e66b245107c0 100644
--- a/Source/core/dom/ContainerNode.cpp
+++ b/Source/core/dom/ContainerNode.cpp
@@ -947,7 +947,7 @@ static void dispatchChildInsertionEvents(Node& child)
 
     // dispatch the DOMNodeInsertedIntoDocument event to all descendants
     if (c->inDocument() && document->hasListenerType(Document::DOMNODEINSERTEDINTODOCUMENT_LISTENER)) {
-        for (; c; c = NodeTraversal::next(c.get(), &child))
+        for (; c; c = NodeTraversal::next(*c, &child))
             c->dispatchScopedEvent(MutationEvent::create(EventTypeNames::DOMNodeInsertedIntoDocument, false));
     }
 }
@@ -975,7 +975,7 @@ static void dispatchChildRemovalEvents(Node& child)
     // dispatch the DOMNodeRemovedFromDocument event to all descendants
     if (c->inDocument() && document->hasListenerType(Document::DOMNODEREMOVEDFROMDOCUMENT_LISTENER)) {
         NodeChildRemovalTracker scope(child);
-        for (; c; c = NodeTraversal::next(c.get(), &child))
+        for (; c; c = NodeTraversal::next(*c, &child))
             c->dispatchScopedEvent(MutationEvent::create(EventTypeNames::DOMNodeRemovedFromDocument, false));
     }
 }