Have Node::lastDescendant() return a reference

Source/core/editing/ReplaceSelectionCommand.h

 /*
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 48 matching lines @@
     virtual EditAction editingAction() const;
 
     class InsertedNodes {
     public:
         void respondToNodeInsertion(Node*);
         void willRemoveNodePreservingChildren(Node*);
         void willRemoveNode(Node*);
         void didReplaceNode(Node*, Node* newNode);
 
         Node* firstNodeInserted() const { return m_firstNodeInserted.get(); }
-        Node* lastLeafInserted() const { return m_lastNodeInserted->lastDescendant(); }
-        Node* pastLastLeaf() const { return m_lastNodeInserted ? NodeTraversal::next(lastLeafInserted()) : 0; }
+        Node& lastLeafInserted() const { ASSERT(m_lastNodeInserted); return m_lastNodeInserted->lastDescendant(); }
+        Node* pastLastLeaf() const { return m_lastNodeInserted ? NodeTraversal::next(&lastLeafInserted()) : 0; }
 
     private:
         RefPtr<Node> m_firstNodeInserted;
         RefPtr<Node> m_lastNodeInserted;
     };
 
     Node* insertAsListItems(PassRefPtr<HTMLElement> listElement, Node* insertionNode, const Position&, InsertedNodes&);
 
     void updateNodesInserted(Node*);
     bool shouldRemoveEndBR(Node*, const VisiblePosition&);
@@ skipping 32 matching lines @@
     bool m_preventNesting;
     bool m_movingParagraph;
     EditAction m_editAction;
     bool m_sanitizeFragment;
     bool m_shouldMergeEnd;
 };
 
 } // namespace WebCore
 
 #endif // ReplaceSelectionCommand_h