Have Document::nodeWillBeRemoved() take a reference

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 12e5c3f7e7be5a37af9fb3597f0c786e1b5be8d8..7cb204a9e08510a2d1d9daeb942a9fcbb9ecf517 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -648,7 +648,7 @@ public:
     // nodeChildrenWillBeRemoved is used when removing all node children at once.
     void nodeChildrenWillBeRemoved(ContainerNode*);
     // nodeWillBeRemoved is only safe when removing one node at a time.
-    void nodeWillBeRemoved(Node*);
+    void nodeWillBeRemoved(Node&);
     bool canReplaceChild(Node* newChild, Node* oldChild);
 
     void didInsertText(Node*, unsigned offset, unsigned length);