Have Document::nodeWillBeRemoved() take a reference

Source/core/editing/Caret.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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 60 matching lines @@
     if (Node* node = m_position.deepEquivalent().deprecatedNode()) {
         invalidateCaretRect(node);
         document = &node->document();
     }
     if (m_position.isNull() || m_position.isOrphan())
         clearCaretRect();
     else
         updateCaretRect(document, m_position);
 }
 
-static bool removingNodeRemovesPosition(Node* node, const Position& position)
+static bool removingNodeRemovesPosition(Node& node, const Position& position)
 {
     if (!position.anchorNode())
         return false;
 
     if (position.anchorNode() == node)
         return true;
 
-    if (!node->isElementNode())
+    if (!node.isElementNode())
         return false;
 
-    Element* element = toElement(node);
-    return element->containsIncludingShadowDOM(position.anchorNode());
+    Element& element = toElement(node);
+    return element.containsIncludingShadowDOM(position.anchorNode());
 }
 
 static void clearRenderViewSelection(const Position& position)
 {
     RefPtr<Document> document = position.document();
     document->updateStyleIfNeeded();
     if (RenderView* view = document->renderView())
         view->clearSelection();
 }
 
-void DragCaretController::nodeWillBeRemoved(Node* node)
+void DragCaretController::nodeWillBeRemoved(Node& node)
 {
-    if (!hasCaret() || (node && !node->inDocument()))
+    if (!hasCaret() || !node.inDocument())
         return;
 
     if (!removingNodeRemovesPosition(node, m_position.deepEquivalent()))
         return;
 
     clearRenderViewSelection(m_position.deepEquivalent());
     clear();
 }
 
 void CaretBase::clearCaretRect()
@@ skipping 152 matching lines @@
     context->fillRect(caret, caretColor);
 }
 
 void DragCaretController::paintDragCaret(Frame* frame, GraphicsContext* p, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const
 {
     if (m_position.deepEquivalent().deprecatedNode()->document().frame() == frame)
         paintCaret(m_position.deepEquivalent().deprecatedNode(), p, paintOffset, clipRect);
 }
 
 }