Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/utils_test.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 utils_test;
 
 import 'package:unittest/unittest.dart';
 import 'test_pub.dart';
 import '../lib/src/utils.dart';
 
@@ skipping 25 matching lines @@
       expect(yamlToString("apostrophe'"), equals('"apostrophe\'"'));
       expect(yamlToString("new\nline"), equals(r'"new\nline"'));
       expect(yamlToString("?unctu@t!on"), equals(r'"?unctu@t!on"'));
     });
 
     test('lists use JSON style', () {
       expect(yamlToString([1, 2, 3]), equals('[1,2,3]'));
     });
 
     test('uses indentation for maps', () {
-      expect(yamlToString({'a': {'b': 1, 'c': 2}, 'd': 3}),
-          equals("""
+      expect(yamlToString({
+        'a': {
+          'b': 1,
+          'c': 2
+        },
+        'd': 3
+      }), equals("""
 a:
   b: 1
   c: 2
 d: 3"""));
     });
 
     test('sorts map keys', () {
-      expect(yamlToString({'a': 1, 'c': 2, 'b': 3, 'd': 4}),
-          equals("""
+      expect(yamlToString({
+        'a': 1,
+        'c': 2,
+        'b': 3,
+        'd': 4
+      }), equals("""
 a: 1
 b: 3
 c: 2
 d: 4"""));
     });
 
     test('quotes map keys as needed', () {
-      expect(yamlToString({'no': 1, 'yes!': 2, '123': 3}),
-          equals("""
+      expect(yamlToString({
+        'no': 1,
+        'yes!': 2,
+        '123': 3
+      }), equals("""
 "123": 3
 no: 1
 "yes!": 2"""));
     });
 
     test('handles non-string map keys', () {
       var map = new Map();
       map[null] = "null";
       map[123] = "num";
       map[true] = "bool";
 
-      expect(yamlToString(map),
-          equals("""
+      expect(yamlToString(map), equals("""
 123: num
 null: null
 true: bool"""));
     });
 
     test('handles empty maps', () {
       expect(yamlToString({}), equals("{}"));
-      expect(yamlToString({'a': {}, 'b': {}}), equals("""
+      expect(yamlToString({
+        'a': {},
+        'b': {}
+      }), equals("""
 a: {}
 b: {}"""));
     });
   });
 }