Fix deprecation warnings in dart:io. Now completely warning free.

sdk/lib/io/timer_impl.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.
 
 part of dart.io;
 
 class _Timer implements Timer {
   // Set jitter to wake up timer events that would happen in _TIMER_JITTER ms.
   static const int _TIMER_JITTER = 0;
 
@@ skipping 66 matching lines @@
     if (_callback != null) {
 
       DoubleLinkedQueueEntry<_Timer> entry = _timers.firstEntry();
       while (entry != null) {
         if (_wakeupTime < entry.element._wakeupTime) {
           entry.prepend(this);
           return;
         }
         entry = entry.nextEntry();
       }
-      _timers.addLast(this);
+      _timers.add(this);
     }
   }
 
 
   void _notifyEventHandler() {
     if (_handling_callbacks) {
       // While we are already handling callbacks we will not notify the event
       // handler. _handleTimeout will call _notifyEventHandler once all pending
       // timers are processed.
       return;
@@ skipping 27 matching lines @@
       int currentTime =
           (new DateTime.now()).millisecondsSinceEpoch + _TIMER_JITTER;
 
       // Collect all pending timers.
       DoubleLinkedQueueEntry<_Timer> entry = _timers.firstEntry();
       var pending_timers = new List();
       while (entry != null) {
         _Timer timer = entry.element;
         if (timer._wakeupTime <= currentTime) {
           entry.remove();
-          pending_timers.addLast(timer);
+          pending_timers.add(timer);
           entry = _timers.firstEntry();
         } else {
           break;
         }
       }
 
       // Trigger all of the pending timers. New timers added as part of the
       // callbacks will be enqueued now and notified in the next spin at the
       // earliest.
       _handling_callbacks = true;
@@ skipping 47 matching lines @@
 _getTimerFactoryClosure() {
   return (int milliSeconds, void callback(Timer timer), bool repeating) {
     if (repeating) {
       return new _Timer.repeating(milliSeconds, callback);
     }
     return new _Timer(milliSeconds, callback);
   };
 }