Have NodeTraversal::previous*() take a reference

Source/core/editing/ApplyStyleCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008, 2009 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 1097 matching lines @@
     while (node) {
         RefPtr<Node> next;
         if (editingIgnoresContent(node.get())) {
             ASSERT(node == end.deprecatedNode() || !node->contains(end.deprecatedNode()));
             next = NodeTraversal::nextSkippingChildren(node.get());
         } else {
             next = NodeTraversal::next(*node);
         }
         if (node->isHTMLElement() && nodeFullySelected(node.get(), start, end)) {
             RefPtr<HTMLElement> elem = toHTMLElement(node);
-            RefPtr<Node> prev = NodeTraversal::previousPostOrder(elem.get());
+            RefPtr<Node> prev = NodeTraversal::previousPostOrder(*elem);
             RefPtr<Node> next = NodeTraversal::next(*elem);
             RefPtr<EditingStyle> styleToPushDown;
             RefPtr<Node> childNode;
             if (isStyledInlineElementToRemove(elem.get())) {
                 styleToPushDown = EditingStyle::create();
                 childNode = elem->firstChild();
             }
 
             removeInlineStyleFromElement(style, elem.get(), RemoveIfNeeded, styleToPushDown.get());
             if (!elem->inDocument()) {
@@ skipping 417 matching lines @@
         String textToMove = nextText->data();
         insertTextIntoNode(childText, childText->length(), textToMove);
         removeNode(next);
         // don't move child node pointer. it may want to merge with more text nodes.
     }
 
     updateStartEnd(newStart, newEnd);
 }
 
 }