Revert async changes.

tests/language/async_test.dart

-// 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.
-
-// VMOptions=--enable_async
-
-import 'package:expect/expect.dart';
-
-import 'dart:async';
-
-topLevelFunction() async { }
-
-Future<int> topLevelWithParameter(int a) async {
-  return 7 + a;
-}
-
-int topLevelWithParameterWrongType(int a) async {
-  return 7 + a;
-}
-
-var what = 'async getter';
-Future<String> get topLevelGetter async {
-  return 'I want to be an ${what}';
-}
-
-class A {
-  static int staticVar = 1;
-
-  static staticMethod(int param) async => staticVar + param;
-  static get staticGetter async => staticVar + 3;
-
-  int _x;
-  A(this._x);
-
-  A.fail() async;  /// constructor2: compile-time error
-  factory A.create() async {return null; } /// constructor3: compile-time error
-
-  int someMethod(int param1, int param2, int param3) async => _x + param2;
-  int get getter async { return 5 + _x; }
-  operator+(A other) async {
-    return new A(_x + other._x);
-  }
-
-  get value => _x;
-}
-
-class B {
-  final _y;
-  const B._internal(this._y);
-  const factory B.createConst(int y) async = A._internal;  /// constructor4: compile-time error
-
-  B();
-
-  set dontDoThat(value) async {}  /// setter1: compile-time error
-}
-
-
-main() {
-  var asyncReturn;
-
-  asyncReturn = topLevelFunction();
-  Expect.isTrue(asyncReturn is Future);
-
-  int a1 = topLevelWithParameter(2);  /// type-mismatch1: static type warning, dynamic type error
-  int a2 = topLevelWithParameterWrongType(2);  /// type-mismatch2: static type warning, dynamic type error
-  asyncReturn = topLevelWithParameter(4);
-  Expect.isTrue(asyncReturn is Future);
-  asyncReturn.then((int result) => Expect.equals(result, 11));
-
-  asyncReturn = topLevelGetter;
-  Expect.isTrue(asyncReturn is Future);
-  asyncReturn.then((String result) =>
-      Expect.stringEquals(result, 'I want to be an async getter'));
-
-  asyncReturn = A.staticMethod(2);
-  Expect.isTrue(asyncReturn is Future);
-  asyncReturn.then((int result) => Expect.equals(result, 3));
-
-  asyncReturn = A.staticGetter;
-  Expect.isTrue(asyncReturn is Future);
-  asyncReturn.then((int result) => Expect.equals(result, 4));
-
-  A a = new A(13);
-
-  asyncReturn = a.someMethod(1,2,3);  /// type-mismatch3: static type warning, dynamic type error
-  Expect.isTrue(asyncReturn is Future);  /// type-mismatch3: continued
-  asyncReturn.then((int result) => Expect.equals(result, 15));  /// type-mismatch3: continued
-
-  asyncReturn = a.getter;  /// type-mismatch4: static type warning, dynamic type error
-  Expect.isTrue(asyncReturn is Future);  /// type-mismatch4: continued
-  asyncReturn.then((int result) => Expect.equals(result, 18));  /// type-mismatch4: continued
-
-  var b = new A(9);
-  asyncReturn = a + b;
-  Expect.isTrue(asyncReturn is Future);
-  asyncReturn.then((A result) => Expect.equals(result.value, 22));
-
-  var foo = 17;
-  bar(int p1, p2) async { 
-    var z = 8;
-    return p2 + z + foo; 
-  }
-  asyncReturn = bar(1,2);
-  Expect.isTrue(asyncReturn is Future);
-  asyncReturn.then((int result) => Expect.equals(result, 27));
-
-  var moreNesting = (int shadowP1, String p2, num p3) {
-    var z = 3;
-    aa(int shadowP1) async {
-      return foo + z + p3 + shadowP1;
-    }
-    return aa(6);
-  };
-  asyncReturn = moreNesting(1, "ignore", 2);
-  Expect.isTrue(asyncReturn is Future);
-  asyncReturn.then((int result) => Expect.equals(result, 28));
-
-  var b1 = const B.createConst(4);  /// constructor4: compile-time error
-  var b2 = new B();
-  b2.dontDoThat = 4;  /// setter1: compile-time error
-}