Have Document::nodeWillBeRemoved() take a reference

Source/core/editing/FrameSelection.h

Index: Source/core/editing/FrameSelection.h
diff --git a/Source/core/editing/FrameSelection.h b/Source/core/editing/FrameSelection.h
index d4edf61e430741a53c69e2e0abb47a4b91497d57..5c34ff65dfa243ebb787e51beba5411e5327fbd8 100644
--- a/Source/core/editing/FrameSelection.h
+++ b/Source/core/editing/FrameSelection.h
@@ -151,7 +151,7 @@ public:
 
     PassRefPtr<Range> toNormalizedRange() const { return m_selection.toNormalizedRange(); }
 
-    void nodeWillBeRemoved(Node*);
+    void nodeWillBeRemoved(Node&);
     void didUpdateCharacterData(CharacterData*, unsigned offset, unsigned oldLength, unsigned newLength);
     void didMergeTextNodes(const Text& oldNode, unsigned offset);
     void didSplitTextNode(const Text& oldNode);
@@ -209,7 +209,7 @@ public:
 private:
     enum EPositionType { START, END, BASE, EXTENT };
 
-    void respondToNodeModification(Node*, bool baseRemoved, bool extentRemoved, bool startRemoved, bool endRemoved);
+    void respondToNodeModification(Node&, bool baseRemoved, bool extentRemoved, bool startRemoved, bool endRemoved);
     TextDirection directionOfEnclosingBlock();
     TextDirection directionOfSelection();