Rename runAsync to scheduleMicrotask.

tests/lib/async/catch_errors24_test.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.
 
 import 'package:async_helper/async_helper.dart';
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'catch_errors.dart';
 
 main() {
@@ skipping 10 matching lines @@
     catchErrors(() {
       controller = new StreamController();
       stream = controller.stream
         .map((x) {
           events.add("map $x");
           return x + 100;
         })
         .transform(new StreamTransformer.fromHandlers(
             handleError: (e, st, sink) { sink.add("error $e"); }))
         .asBroadcastStream();
-      runAsync(() {
+      scheduleMicrotask(() {
         stream.listen((x) {
           events.add("stream $x");
           if (x == "error 2") done.complete(true);
         });
       });
     }).listen((x) { events.add(x); })
       .asFuture().then((_) { Expect.fail("Unexpected callback"); });
     stream.listen((x) { events.add("stream2 $x"); });
-    runAsync(() {
+    scheduleMicrotask(() {
       controller.add(1);
       // Errors are not allowed to traverse boundaries, but in this case the
       // first listener of the broadcast stream is in the same error-zone. So
       // this should work.
       controller.addError(2);
       controller.close();
     });
   }).listen((x) { events.add("outer: $x"); },
             onDone: () { Expect.fail("Unexpected callback"); });
 
   done.future.whenComplete(() {
     // Give handlers time to complete.
     Timer.run(() {
       Expect.listEquals(["map 1",
                           "stream2 101",
                           "stream 101",
                           "stream2 error 2",
                           "stream error 2",
                         ],
                         events);
       asyncEnd();
     });
   });
 }