Remove Attr child nodes (making Attr a Node, not a ContainerNode)

LayoutTests/dom/xhtml/level1/core/hc_attrsetvalue1.js

 /*
 Copyright © 2001-2004 World Wide Web Consortium,
 (Massachusetts Institute of Technology, European Research Consortium
 for Informatics and Mathematics, Keio University). All
 Rights Reserved. This work is distributed under the W3C® Software License [1] in the
 hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
 [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 */
@@ skipping 65 matching lines @@
 */
 function hc_attrsetvalue1() {
    var success;
     if(checkInitialization(builder, "hc_attrsetvalue1") != null) return;
     var doc;
       var acronymList;
       var testNode;
       var attributes;
       var titleAttr;
       var value;
-      var retval;
-      var firstChild;
-      var otherChild;
 
       var docRef = null;
       if (typeof(this.doc) != 'undefined') {
         docRef = this.doc;
       }
       doc = load(docRef, "doc", "hc_staff");
       acronymList = doc.getElementsByTagName("acronym");
       testNode = acronymList.item(3);
       attributes = testNode.attributes;
 
       titleAttr = attributes.getNamedItem("title");
-      firstChild = titleAttr.firstChild;
 
-      assertNotNull("attrChildNotNull",firstChild);
-titleAttr.value = "Tomorrow";
-
-      firstChild.nodeValue = "impl reused node";
+      titleAttr.value = "Tomorrow";
 
       value = titleAttr.value;
+      assertEquals("attrValue","Tomorrow",value);
 
-      assertEquals("attrValue","Tomorrow",value);
-       value = titleAttr.nodeValue;
-
+      value = titleAttr.nodeValue;
       assertEquals("attrNodeValue","Tomorrow",value);
-       firstChild = titleAttr.lastChild;
-
-      value = firstChild.nodeValue;
-
-      assertEquals("firstChildValue","Tomorrow",value);
-       otherChild = firstChild.nextSibling;
-
-      assertNull("nextSiblingIsNull",otherChild);
-
 }
 
 function runTest() {
    hc_attrsetvalue1();
 }