Revert "Build Observatory with runtime"

runtime/observatory/lib/src/elements/flag_list.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 flag_list_element;
-
-import 'package:polymer/polymer.dart';
-import 'observatory_element.dart';
-import 'package:observatory/service.dart';
-
-@CustomTag('flag-list')
-class FlagListElement extends ObservatoryElement {
-  @published ServiceMap flagList;
-
-  FlagListElement.created() : super.created();
-
-  void refresh(var done) {
-    flagList.reload().whenComplete(done);
-  }
-}
-
-@CustomTag('flag-item')
-class FlagItemElement extends ObservatoryElement {
-  @published ObservableMap flag;
-
-  FlagItemElement.created() : super.created();
-}