Removed polymer & mirror from Observatory

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';
-import 'package:observatory/src/elements/shims/binding.dart';
-
-class ErrorRefElementWrapper extends HtmlElement {
-
-  static const binder = const Binder<ErrorRefElementWrapper>(const {
-      'ref': #ref
-    });
-
-  static const tag = const Tag<ErrorRefElementWrapper>('error-ref');
-
-  DartError _error;
-
-  DartError get ref => _error;
-
-  void set ref(DartError value) {
-    _error = value;
-    render();
-  }
-
-  ErrorRefElementWrapper.created() : super.created() {
-    binder.registerCallback(this);
-    createShadowRoot();
-    render();
-  }
-
-  @override
-  void attached() {
-    super.attached();
-    render();
-  }
-
-  void render() {
-    shadowRoot.children = [];
-    if (_error == null) {
-      return;
-    }
-
-    shadowRoot.children = [
-      new StyleElement()
-        ..text = '''
-        error-ref-wrapped > pre {
-          background-color: #f5f5f5;
-          border: 1px solid #ccc;
-          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)
-    ];
-  }
-}