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

sdk/lib/_internal/pub_generated/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart

Index: sdk/lib/_internal/pub_generated/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart
diff --git a/sdk/lib/_internal/pub/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart b/sdk/lib/_internal/pub_generated/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart
similarity index 87%
copy from sdk/lib/_internal/pub/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart
copy to sdk/lib/_internal/pub_generated/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart
index aac2261b2465a3999277ebc56ab2f8273e40e5f0..a6a65518b32ad39bcecd3098cc99de7f1de2ce8f 100644
--- a/sdk/lib/_internal/pub/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/oauth2/with_no_credentials_authenticates_and_saves_credentials_test.dart
@@ -12,8 +12,9 @@ import 'utils.dart';
 
 main() {
   initConfig();
-  integration('with no credentials.json, authenticates and saves '
-      'credentials.json', () {
+  integration(
+      'with no credentials.json, authenticates and saves ' 'credentials.json',
+      () {
     d.validPackage.create();
 
     var server = new ScheduledServer();
@@ -22,7 +23,8 @@ main() {
     authorizePub(pub, server);
 
     server.handle('GET', '/api/packages/versions/new', (request) {
-      expect(request.headers,
+      expect(
+          request.headers,
           containsPair('authorization', 'Bearer access token'));
 
       return new shelf.Response(200);
@@ -34,4 +36,4 @@ main() {
 
     d.credentialsFile(server, 'access token').validate();
   });
-}
+}