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

sdk/lib/_internal/pub_generated/test/lock_file_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 lock_file_test;
 
 import 'dart:async';
 
 import 'package:pub_semver/pub_semver.dart';
 import 'package:unittest/unittest.dart';
 import 'package:yaml/yaml.dart';
 
 import '../lib/src/lock_file.dart';
 import '../lib/src/package.dart';
 import '../lib/src/pubspec.dart';
 import '../lib/src/source.dart';
 import '../lib/src/source_registry.dart';
 import 'test_pub.dart';
 
 class MockSource extends Source {
   final String name = 'mock';
 
-  Future<Pubspec> doDescribe(PackageId id) => throw new UnsupportedError(
-      "Cannot describe mock packages.");
+  Future<Pubspec> doDescribe(PackageId id) =>
+      throw new UnsupportedError("Cannot describe mock packages.");
 
-  Future get(PackageId id, String symlink) => throw new UnsupportedError(
-      "Cannot get a mock package.");
+  Future get(PackageId id, String symlink) =>
+      throw new UnsupportedError("Cannot get a mock package.");
 
-  Future<String> getDirectory(PackageId id) => throw new UnsupportedError(
-      "Cannot get the directory for mock packages.");
+  Future<String> getDirectory(PackageId id) =>
+      throw new UnsupportedError("Cannot get the directory for mock packages.");
 
   dynamic parseDescription(String filePath, String description,
-                           {bool fromLockFile: false}) {
+      {bool fromLockFile: false}) {
     if (!description.endsWith(' desc')) throw new FormatException();
     return description;
   }
 
   bool descriptionsEqual(description1, description2) =>
       description1 == description2;
 
   String packageName(String description) {
     // Strip off ' desc'.
     return description.substring(0, description.length - 5);
@@ skipping 153 matching lines @@
       });
     });
 
     group('serialize()', () {
       var lockfile;
       setUp(() {
         lockfile = new LockFile.empty();
       });
 
       test('dumps the lockfile to YAML', () {
-        lockfile.packages['foo'] = new PackageId(
-            'foo', mockSource.name, new Version.parse('1.2.3'), 'foo desc');
-        lockfile.packages['bar'] = new PackageId(
-            'bar', mockSource.name, new Version.parse('3.2.1'), 'bar desc');
+        lockfile.packages['foo'] =
+            new PackageId('foo', mockSource.name, new Version.parse('1.2.3'), 'foo desc');
+        lockfile.packages['bar'] =
+            new PackageId('bar', mockSource.name, new Version.parse('3.2.1'), 'bar desc');
 
         expect(loadYaml(lockfile.serialize(null, sources)), equals({
           'packages': {
             'foo': {
               'version': '1.2.3',
               'source': 'mock',
               'description': 'foo desc'
             },
             'bar': {
               'version': '3.2.1',
               'source': 'mock',
               'description': 'bar desc'
             }
           }
         }));
       });
     });
   });
 }