Reapply revert of "Make stdout/stderr async"

tests/standalone/io/stdout_stderr_non_blocking_test.dart

Index: tests/standalone/io/stdout_stderr_non_blocking_test.dart
diff --git a/tests/standalone/io/stdout_stderr_test.dart b/tests/standalone/io/stdout_stderr_non_blocking_test.dart
similarity index 82%
copy from tests/standalone/io/stdout_stderr_test.dart
copy to tests/standalone/io/stdout_stderr_non_blocking_test.dart
index 296a8d6415a76f474f498cfa4f62d5678325ae24..061e8557d3ddcc2083e04ddce859b234b5a22f00 100644
--- a/tests/standalone/io/stdout_stderr_test.dart
+++ b/tests/standalone/io/stdout_stderr_non_blocking_test.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2014, 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.
 
@@ -33,10 +33,10 @@ callIOSink(IOSink sink) {
 }
 
 main() {
-  callIOSink(stdout);
-  stdout.done.then((_) {
-    callIOSink(stderr);
-    stderr.done.then((_) {
+  callIOSink(stdout.nonBlocking);
+  stdout.nonBlocking.done.then((_) {
+    callIOSink(stderr.nonBlocking);
+    stderr.nonBlocking.done.then((_) {
       stdout.close();
       stderr.close();
     });