Removed polymer & mirror from Observatory

runtime/observatory/lib/src/elements/library_ref_as_value.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 library_ref_as_value_element;
-
-import 'package:observatory/service.dart';
-import 'package:polymer/polymer.dart';
-import 'service_ref.dart';
-import 'dart:async';
-
-@CustomTag('library-ref-as-value')
-class LibraryRefAsValueElement extends ServiceRefElement {
-  LibraryRefAsValueElement.created() : super.created();
-
-  String makeExpandKey(String key) {
-    return '${expandKey}/${key}';
-  }
-
-  dynamic expander() {
-    return expandEvent;
-  }
-
-  void expandEvent(bool expand, Function onDone) {
-    if (expand) {
-      Library lib = ref;
-      lib.reload().then((result) {
-        return Future.wait(lib.variables.map((field) => field.reload()));
-      }).whenComplete(onDone);
-    } else {
-      onDone();
-    }
-  }
-}