Dart: Simplifies the handle watcher. Various cleanups and bugfixes.

mojo/public/dart/src/timer_queue.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 part of core;
 
 class Timeout implements Comparable<Timeout> {
   int deadline;  // milliseconds since the Unix epoch.
   SendPort port;
 
   Timeout(this.port, this.deadline);
 
-  int compareTo(Timeout other)  => other.daedline - deadline;
+  int compareTo(Timeout other)  => other.deadline - deadline;
 }
 
 class TimerQueue {
   SplayTreeSet _set;
   Timeout _nextTimer;
 
   TimerQueue() : _set = new SplayTreeSet();
 
   void updateTimer(SendPort port, int deadline) {
     var removedTimeout = null;
@@ skipping 20 matching lines @@
       _nextTimer = null;
     }
   }
 
   void removeCurrent() => updateTimer(currentPort, -1);
 
   bool get hasTimer => _nextTimer != null;
   int get currentTimeout => _nextTimer.deadline;
   SendPort get currentPort => _nextTimer.port;
 }