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

Source/core/html/HTMLElement.cpp

Index: Source/core/html/HTMLElement.cpp
diff --git a/Source/core/html/HTMLElement.cpp b/Source/core/html/HTMLElement.cpp
index 9c9a776281cbb8d71904a31f8dd1135f840f1606..bce726aed0cc2e3b19b9631333455dbc13e77218 100644
--- a/Source/core/html/HTMLElement.cpp
+++ b/Source/core/html/HTMLElement.cpp
@@ -777,7 +777,7 @@ static void setHasDirAutoFlagRecursively(Node* firstNode, bool flag, Node* lastN
         node->setSelfOrAncestorHasDirAutoAttribute(flag);
         if (node == lastNode)
             return;
-        node = NodeTraversal::next(node, firstNode);
+        node = NodeTraversal::next(*node, firstNode);
     }
 }
 
@@ -851,7 +851,7 @@ TextDirection HTMLElement::directionality(Node** strongDirectionalityTextNode) c
                 return textDirection;
             }
         }
-        node = NodeTraversal::next(node, this);
+        node = NodeTraversal::next(*node, this);
     }
     if (strongDirectionalityTextNode)
         *strongDirectionalityTextNode = 0;