Use runAsync for Futures.

sdk/lib/async/future_impl.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;
 
 deprecatedFutureValue(_FutureImpl future) =>
   future._isComplete ? future._resultOrListeners : null;
 
 abstract class _Completer<T> implements Completer<T> {
@@ skipping 199 matching lines @@
       listeners = listener._nextListener;
       listener._nextListener = null;
       listener._sendError(error);
     } while (listeners != null);
   }
 
   void _scheduleUnhandledError() {
     _state |= _UNHANDLED_ERROR;
     // Wait for the rest of the current event's duration to see
     // if a subscriber is added to handle the error.
-    Timer.run(() {
+    runAsync(() {
       if (_hasUnhandledError) {
         // No error handler has been added since the error was set.
         _clearUnhandledError();
         var error = _resultOrListeners;
         print("Uncaught Error: ${error}");
         var trace = getAttachedStackTrace(error);
         if (trace != null) {
           print("Stack Trace:\n$trace\n");
         }
         throw error;
       }
     });
   }
 
   void _addListener(_FutureListener listener) {
     if (_isComplete) {
       _clearUnhandledError();
       // Handle late listeners asynchronously.
-      Timer.run(() {
+      runAsync(() {
         if (_hasValue) {
           T value = _resultOrListeners;
           listener._sendValue(value);
         } else {
           assert(_hasError);
           listener._sendError(_resultOrListeners);
         }
       });
     } else {
       assert(!_isComplete);
@@ skipping 214 matching lines @@
           _setError(error);
         }, onError: _setError);
         return;
       }
     } catch (e, s) {
       error = _asyncError(e, s);
     }
     _setError(error);
   }
 }