webui fixes for 0.8.9

lib/watcher.dart

 // Copyright (c) 2012, 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.
 
 /**
  * A library to observe changes on Dart objects.
  *
  * Similar to the principle of watchers in AngularJS, this library provides the
  * mechanisms to observe and react to changes that happen in an application's
  * data model.
@@ skipping 28 matching lines @@
  *
  * You can watch several kinds of expressions, including lists. See [watch] for
  * more details.
  *
  * A common design pattern for MVC applications is to call [dispatch] at the end
  * of each event loop (e.g. after each UI event is fired). Our view library does
  * this automatically.
  */
 library watcher;
 
-import 'dart:async';
 import 'dart:collection' hide LinkedList, LinkedListEntry;
 import 'observe.dart';
 import 'src/linked_list.dart';
 import 'package:logging/logging.dart';
 
 /**
  * True to use the [observe] library instead of watchers.
  *
  * Observers require the [observable] annotation on objects and for collection
  * types to be observable, such as [ObservableList]. But in return they offer
@@ skipping 411 matching lines @@
 class _WatcherType {
   final _value;
   const _WatcherType._internal(this._value);
   toString() => 'Enum.$_value';
 
   static const LIST = const _WatcherType._internal('LIST');
   static const HASH_MAP = const _WatcherType._internal('HASH_MAP');
   static const ORDERED_MAP = const _WatcherType._internal('ORDERED_MAP');
   static const OTHER = const _WatcherType._internal('OTHER');
 }