Revert "Build Observatory with runtime"

runtime/observatory/lib/src/elements/instance_ref.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 instance_ref_element;
-
-import 'package:polymer/polymer.dart';
-import 'package:observatory/service.dart';
-import 'service_ref.dart';
-
-@CustomTag('instance-ref')
-class InstanceRefElement extends ServiceRefElement {
-  InstanceRefElement.created() : super.created();
-
-  String get hoverText {
-    if (ref != null) {
-      if (ref.type == 'Sentinel') {
-        if (ref.id == 'objects/optimized-out') {
-          return 'This object is no longer needed and has been removed by the optimizing compiler.';
-        } else if (ref.id == 'objects/collected') {
-          return 'This object has been reclaimed by the garbage collector.';
-        } else if (ref.id == 'objects/expired') {
-          return 'The handle to this object has expired.  Consider refreshing the page.';
-        } else if (ref.id == 'objects/not-initialized') {
-          return 'This object will be initialized once it is accessed by the program.';
-        } else if (ref.id == 'objects/being-initialized') {
-          return 'This object is currently being initialized.';
-        }
-      }
-    }
-    return super.hoverText;
-  }
-
-  // TODO(turnidge): This is here to workaround vm/dart2js differences.
-  dynamic expander() {
-    return expandEvent;
-  }
-
-  void expandEvent(bool expand, Function onDone) {
-    assert(ref is Instance);
-    if (expand) {
-      ref.reload().then((result) {
-        if (result.valueAsString != null) {
-          result.name = result.valueAsString;
-          result.vmName = result.valueAsString;
-        }
-        ref = result;
-        notifyPropertyChange(#ref, 0, 1);
-      }).whenComplete(onDone);
-    } else {
-      Instance refMap = ref;
-      refMap.fields = null;
-      refMap.elements = null;
-      onDone();
-    }
-  }
-}