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

Source/core/editing/htmlediting.cpp

Index: Source/core/editing/htmlediting.cpp
diff --git a/Source/core/editing/htmlediting.cpp b/Source/core/editing/htmlediting.cpp
index 0ded336651c34c41182c4cf265ac7a18338f4980..0a06d6caa0d5f80840defeb21fb4026fbc996591 100644
--- a/Source/core/editing/htmlediting.cpp
+++ b/Source/core/editing/htmlediting.cpp
@@ -610,7 +610,7 @@ static bool hasARenderedDescendant(Node* node, Node* excludedNode)
         }
         if (n->renderer())
             return true;
-        n = NodeTraversal::next(n, node);
+        n = NodeTraversal::next(*n, node);
     }
     return false;
 }