Have NodeWithIndex deal with references instead of pointers

Source/core/dom/Range.h

Index: Source/core/dom/Range.h
diff --git a/Source/core/dom/Range.h b/Source/core/dom/Range.h
index 3a7a4705e9abcb9e092d0f1da886e0015041b21d..6f50ba56d892695ba5b801fffd5142e75e651917 100644
--- a/Source/core/dom/Range.h
+++ b/Source/core/dom/Range.h
@@ -134,8 +134,8 @@ public:
 
     void didInsertText(Node*, unsigned offset, unsigned length);
     void didRemoveText(Node*, unsigned offset, unsigned length);
-    void didMergeTextNodes(NodeWithIndex& oldNode, unsigned offset);
-    void didSplitTextNode(Text* oldNode);
+    void didMergeTextNodes(const NodeWithIndex& oldNode, unsigned offset);
+    void didSplitTextNode(Text& oldNode);
 
     // Expand range to a unit (word or sentence or block or document) boundary.
     // Please refer to https://bugs.webkit.org/show_bug.cgi?id=27632 comment #5