Rework the <field-view> page.

runtime/bin/vmservice/client/lib/src/elements/response_viewer.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 response_viewer_element;
 
 import 'observatory_element.dart';
 import 'package:observatory/app.dart';
 import 'package:polymer/polymer.dart';
 
 @CustomTag('response-viewer')
 class ResponseViewerElement extends ObservatoryElement {
   @published ObservatoryApplication app;
   ResponseViewerElement.created() : super.created();
-}
+}