Have ReplaceSelectionCommand::InsertedNodes API take references in argument

Source/core/editing/ReplaceSelectionCommand.h

Index: Source/core/editing/ReplaceSelectionCommand.h
diff --git a/Source/core/editing/ReplaceSelectionCommand.h b/Source/core/editing/ReplaceSelectionCommand.h
index b9f5da64f6f4004e1d9978e89f7a9f973cd1588c..dfe26478075ab5cc673a389b5fb80419f0dd96ff 100644
--- a/Source/core/editing/ReplaceSelectionCommand.h
+++ b/Source/core/editing/ReplaceSelectionCommand.h
@@ -60,10 +60,10 @@ private:
 
     class InsertedNodes {
     public:
-        void respondToNodeInsertion(Node*);
-        void willRemoveNodePreservingChildren(Node*);
-        void willRemoveNode(Node*);
-        void didReplaceNode(Node*, Node* newNode);
+        void respondToNodeInsertion(Node&);
+        void willRemoveNodePreservingChildren(Node&);
+        void willRemoveNode(Node&);
+        void didReplaceNode(Node&, Node& newNode);
 
         Node* firstNodeInserted() const { return m_firstNodeInserted.get(); }
         Node& lastLeafInserted() const { ASSERT(m_lastNodeInserted); return m_lastNodeInserted->lastDescendant(); }