Update charted to 0.4.8 and roll

packages/watcher/lib/src/file_watcher/native.dart

 // Copyright (c) 2015, 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.file_watcher.native;
-
 import 'dart:async';
 import 'dart:io';
 
 import '../file_watcher.dart';
 import '../resubscribable.dart';
 import '../utils.dart';
 import '../watch_event.dart';
 
 /// Uses the native file system notifications to watch for filesystem events.
 ///
@@ skipping 61 matching lines @@
       close();
     }
   }
 
   void close() {
     if (_subscription != null) _subscription.cancel();
     _subscription = null;
     _eventsController.close();
   }
 }