Change Future.delayed to take a Duration.

tests/standalone/io/fuzz_support.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.
 
 library fuzz_support;
 
 import 'dart:async';
 import 'dart:io';
 
 const typeMapping = const {
@@ skipping 31 matching lines @@
 // Perform sync operation and ignore all exceptions.
 doItSync(Function f) {
   try { f(); } catch (e) {}
 }
 
 // Perform async operation and transform the future for the operation
 // into a future that never fails by treating errors as normal
 // completion.
 Future doItAsync(void f()) {
   // Ignore value and errors.
-  return new Future.delayed(0, f).catchError((_) {}).then((_) => true);
+  return new Future.delayed(Duration.ZERO, f)
+    .catchError((_) {})
+    .then((_) => true);
 }