Revert "Build Observatory with runtime"

runtime/bin/vmservice/observatory/lib/src/elements/field_view.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 field_view_element;
 
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
 
 @CustomTag('field-view')
 class FieldViewElement extends ObservatoryElement {
   @published Field field;
   FieldViewElement.created() : super.created();
 
   void refresh(var done) {
     field.reload().whenComplete(done);
   }
 }