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

sdk/lib/_internal/pub_generated/test/lock_file_test.dart

Index: sdk/lib/_internal/pub_generated/test/lock_file_test.dart
diff --git a/sdk/lib/_internal/pub/test/lock_file_test.dart b/sdk/lib/_internal/pub_generated/test/lock_file_test.dart
similarity index 88%
copy from sdk/lib/_internal/pub/test/lock_file_test.dart
copy to sdk/lib/_internal/pub_generated/test/lock_file_test.dart
index a2ce2f7a1f4b809b555049f2ce2760096ae87c43..de144c2a5b4f24f59cb0deff98df4441e9766f16 100644
--- a/sdk/lib/_internal/pub/test/lock_file_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/lock_file_test.dart
@@ -20,17 +20,17 @@ 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;
   }
@@ -204,10 +204,10 @@ packages:
       });
 
       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': {