Converted Observatory persistent-hangles-page element

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

 // Copyright (c) 2016, 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.
 
 import 'dart:html';
 
 import 'package:observatory/app.dart';
 import 'package:observatory/service.dart';
 import 'package:observatory/src/elements/error_ref.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
@@ skipping 33 matching lines @@
     if (_error == null) {
       return;
     }
 
     shadowRoot.children = [
       new StyleElement()
         ..text = '''
         error-ref-wrapped > pre {
           background-color: #f5f5f5;
           border: 1px solid #ccc;
-          padding: 10px;
+          padding-left: 10px;
+          padding-right: 10px;
           font-family: consolas, courier, monospace;
           font-size: 1em;
           line-height: 1.2em;
           white-space: pre;
         }
         ''',
       new ErrorRefElement(_error, queue: ObservatoryApplication.app.queue)
     ];
   }
 }