Updated charted DEP to 0.4.X

packages/charted/lib/core/timer.dart

 //
 // Copyright 2014 Google Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 //
 
 /// A [window.requestAnimationFrame] based timer for use with transitions.
 /// Uses [dart.async.Timer] when the time until next timeout is too long.
 library charted.core.timer;
 
 import 'dart:async';
 import 'dart:html' show window;
 import 'dart:collection';
 
 typedef bool TimerCallback(int time);
 
-class AnimationTimer extends LinkedListEntry {
+class AnimationTimer extends LinkedListEntry<AnimationTimer> {
   static LinkedList<AnimationTimer> _queue = new LinkedList<AnimationTimer>();
 
   /// true if we are already waiting for window.animationFrame. At any given
   /// time, only one of _timerScheduled and _animationFrameRequested are set
   static bool _animationFrameRequested = false;
 
   /// Instance of currently scheduled timer. At any given time, only one
   /// of _timerScheduled and _animationFrameRequested are set.
   static Timer _timerScheduled;
 
@@ skipping 41 matching lines @@
         earliest = timer.time;
       }
       timer = timer.next;
       if (finished) ref.unlink();
     }
     active = null;
     return earliest == null ? earliest : earliest - now;
   }
 
   /// Internal timer and animation frame handler.
-  _step([_]) {
+  _step([num _]) {
     int delay = flush();
 
     if (delay == null) {
       _animationFrameRequested = false;
     } else if (delay > 24) {
       if (_timerScheduled != null) {
         _timerScheduled.cancel();
       }
       _timerScheduled = new Timer(new Duration(milliseconds: delay), _step);
       _animationFrameRequested = false;
     } else {
       _animationFrameRequested = true;
       window.animationFrame.then(_step);
     }
   }
 }