Supporting both FieldRef and InstanceRef in RetainingPathItem.parentField

runtime/observatory/lib/src/elements/retaining_path.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/curly_block.dart';
 import 'package:observatory/src/elements/instance_ref.dart';
 import 'package:observatory/src/elements/helpers/any_ref.dart';
@@ skipping 81 matching lines @@
       ];
     }
     return _path.elements.map(_createItem).toList();
   }
 
   Element _createItem(M.RetainingPathItem item) {
     final content = <Element>[];
 
     if (item.parentField != null) {
       content.add(
-        new DivElement()
+        new SpanElement()
           ..children = [
               new SpanElement()..text = 'from ',
-                new InstanceRefElement(_isolate, item.parentField, _instances,
-                                       queue: _r.queue),
+              anyRef(_isolate, item.parentField, _instances, queue: _r.queue),
               new SpanElement()..text = ' of ',
           ]);
     } else if (item.parentListIndex != null) {
       content.add(
         new SpanElement()
           ..text = 'from [ ${item.parentListIndex} ] of ');
     } else if (item.parentWordOffset != null) {
       content.add(
         new SpanElement()
           ..text = 'from word [ ${item.parentWordOffset} ] of ');
     } else {
       content.add(new SpanElement()..text = 'from ');
     }
 
     content.add(
       anyRef(_isolate, item.source, _instances, queue: _r.queue)
     );
 
     return new DivElement()..classes = ['indent']..children = content;
   }
 }