Make Zone API strong mode clean.

sdk/lib/async/timer.dart

 // Copyright (c) 2012, 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.async;
 
 /**
  * A count-down timer that can be configured to fire once or repeatedly.
  *
  * The timer counts down from the specified duration to 0.
@@ skipping 30 matching lines @@
    *
    * The [callback] function is invoked after the given [duration].
    *
    */
   factory Timer(Duration duration, void callback()) {
     if (Zone.current == Zone.ROOT) {
       // No need to bind the callback. We know that the root's timer will
       // be invoked in the root zone.
       return Zone.current.createTimer(duration, callback);
     }
-    return Zone.current.createTimer(
-        duration, Zone.current.bindCallback(callback, runGuarded: true));
+    return Zone.current
+        .createTimer(duration, Zone.current.bindCallbackGuarded(callback));
   }
 
   /**
    * Creates a new repeating timer.
    *
    * The [callback] is invoked repeatedly with [duration] intervals until
    * canceled with the [cancel] function.
    *
    * The exact timing depends on the underlying timer implementation.
    * No more than `n` callbacks will be made in `duration * n` time,
    * but the time between two consecutive callbacks
    * can be shorter and longer than `duration`.
    *
    * In particular, an implementation may schedule the next callback, e.g.,
    * a `duration` after either when the previous callback ended,
    * when the previous callback started, or when the previous callback was
    * scheduled for - even if the actual callback was delayed.
    */
   factory Timer.periodic(Duration duration, void callback(Timer timer)) {
     if (Zone.current == Zone.ROOT) {
       // No need to bind the callback. We know that the root's timer will
       // be invoked in the root zone.
       return Zone.current.createPeriodicTimer(duration, callback);
     }
-    // TODO(floitsch): the return type should be 'void', and the type
-    // should be inferred.
-    var boundCallback = Zone.current
-        .bindUnaryCallback<dynamic, Timer>(callback, runGuarded: true);
+    var boundCallback = Zone.current.bindUnaryCallbackGuarded<Timer>(callback);
     return Zone.current.createPeriodicTimer(duration, boundCallback);
   }
 
   /**
    * Runs the given [callback] asynchronously as soon as possible.
    *
    * This function is equivalent to `new Timer(Duration.ZERO, callback)`.
    */
   static void run(void callback()) {
     new Timer(Duration.ZERO, callback);
@@ skipping 11 matching lines @@
    * and the timer has not been canceled.
    *
    * A periodic timer is active if it has not been canceled.
    */
   bool get isActive;
 
   external static Timer _createTimer(Duration duration, void callback());
   external static Timer _createPeriodicTimer(
       Duration duration, void callback(Timer timer));
 }