Revert "Build Observatory with runtime"

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

-// Copyright (c) 2013, 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.
-
-library inbound_reference_element;
-
-import 'dart:async';
-import 'package:polymer/polymer.dart';
-import 'package:observatory/service.dart';
-import 'observatory_element.dart';
-
-@CustomTag('inbound-reference')
-class InboundReferenceElement extends ObservatoryElement {
-  @published ObservableMap ref;
-  InboundReferenceElement.created() : super.created();
-
-  dynamic get slot => ref['slot'];
-  bool get slotIsArrayIndex => slot is num;
-  bool get slotIsField => slot is ServiceMap && slot['type'] == '@Field';
-
-  ServiceObject get source => ref['source'];
-
-  // I.e., inbound references to 'source' for recursive pointer chasing.
-  @observable ObservableList inboundReferences;
-  Future<ServiceObject> fetchInboundReferences(arg) {
-    return source.isolate.get(source.id + "/inbound_references?limit=$arg")
-        .then((ServiceMap response) {
-          inboundReferences = new ObservableList.from(response['references']);
-        });
-  }
-
-  // TODO(turnidge): This is here to workaround vm/dart2js differences.
-  dynamic expander() {
-    return expandEvent;
-  }
-
-  void expandEvent(bool expand, Function onDone) {
-    if (expand) {
-      fetchInboundReferences(100).then((result) {
-        notifyPropertyChange(#ref, 0, 1);
-      }).whenComplete(onDone);
-    } else {
-      inboundReferences = null;
-      onDone();
-    }
-  }
-}