Have Document::nodeWillBeRemoved() take a reference

Source/core/dom/NodeIterator.h

Index: Source/core/dom/NodeIterator.h
diff --git a/Source/core/dom/NodeIterator.h b/Source/core/dom/NodeIterator.h
index 4c504bf75c2d76258aeda16eb2f7ae80e1f5b46c..1f06a57c3e4726af5edf85404d044cb9e3adb133 100644
--- a/Source/core/dom/NodeIterator.h
+++ b/Source/core/dom/NodeIterator.h
@@ -51,7 +51,7 @@ public:
     bool pointerBeforeReferenceNode() const { return m_referenceNode.isPointerBeforeNode; }
 
     // This function is called before any node is removed from the document tree.
-    void nodeWillBeRemoved(Node*);
+    void nodeWillBeRemoved(Node&);
 
 private:
     NodeIterator(PassRefPtr<Node>, unsigned whatToShow, PassRefPtr<NodeFilter>);
@@ -66,7 +66,7 @@ private:
         bool moveToPrevious(Node* root);
     };
 
-    void updateForNodeRemoval(Node* nodeToBeRemoved, NodePointer&) const;
+    void updateForNodeRemoval(Node& nodeToBeRemoved, NodePointer&) const;
 
     NodePointer m_referenceNode;
     NodePointer m_candidateNode;