Fix identity and SVGAnimatedString issues with element_classes_test

tools/dom/templates/html/impl/impl_Node.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 /**
  * Lazy implementation of the child nodes of an element that does not request
  * the actual child nodes of an element until strictly necessary greatly
  * improving performance for the typical cases where it is not required.
@@ skipping 96 matching lines @@
     var result = this[index];
     if (result != null) {
       _this._removeChild(result);
     }
     return result;
   }
 
   bool remove(Object object) {
     if (object is! Node) return false;
     Node node = object;
+$if JSINTEROP
+    // We aren't preserving identity of nodes in JSINTEROP mode
+    if (_this != node.parentNode) return false;
+$else
     if (!identical(_this, node.parentNode)) return false;
+$endif
     _this._removeChild(node);
     return true;
   }
 
   void _filter(bool test(Node node), bool removeMatching) {
     // This implementation of removeWhere/retainWhere is more efficient
     // than the default in ListBase. Child nodes can be removed in constant
     // time.
     Node child = _this.firstChild;
     while (child != null) {
@@ skipping 176 matching lines @@
    */
   @DomName('Node.childNodes')
   @DocsEditable()
   @Returns('NodeList')
   @Creates('NodeList')
   final List<Node> childNodes;
 
 $endif
 $!MEMBERS
 }