Rename runAsync to scheduleMicrotask.

tests/lib/async/intercept_run_async4_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';
 
 var events = [];
 
 body() {
   events.add("body entry");
-  runAsync(() {
+  scheduleMicrotask(() {
     events.add("run async body");
-    runAsync(() {
+    scheduleMicrotask(() {
       events.add("run nested body");
     });
   });
   return 499;
 }
 
 handler(fun) {
   events.add("handler");
-  runAsync(fun);
+  scheduleMicrotask(fun);
   events.add("handler done");
 }
 
 main() {
   asyncStart();
 
-  // Test that body of a runAsync goes to the zone it came from.
-  var result = runZonedExperimental(body, onRunAsync: handler);
+  // Test that body of a scheduleMicrotask goes to the zone it came from.
+  var result = runZonedExperimental(body, onScheduleMicrotask: handler);
   events.add("after");
-  runAsync(() {
-    runAsync(() {
+  scheduleMicrotask(() {
+    scheduleMicrotask(() {
       Expect.listEquals(
           ["body entry",
            "handler", "handler done",
            "after",
            "run async body",
            "handler", "handler done",
            "run nested body"],
           events);
       asyncEnd();
     });
   });
 }