Update charted to 0.4.8 and roll

packages/watcher/lib/src/resubscribable.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 watcher.resubscribable;
-
 import 'dart:async';
 
 import '../watcher.dart';
 import 'watch_event.dart';
 
 typedef ManuallyClosedWatcher WatcherFactory();
 
 /// A wrapper for [ManuallyClosedWatcher] that encapsulates support for closing
 /// the watcher when it has no subscribers and re-opening it when it's
 /// re-subscribed.
@@ skipping 51 matching lines @@
 /// An interface for watchers with an explicit, manual [close] method.
 ///
 /// See [ResubscribableWatcher].
 abstract class ManuallyClosedWatcher implements Watcher {
   /// Closes the watcher.
   ///
   /// Subclasses should close their [events] stream and release any internal
   /// resources.
   void close();
 }