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

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

Index: sdk/lib/_internal/pub_generated/test/oauth2/with_a_malformed_credentials_authenticates_again_test.dart
diff --git a/sdk/lib/_internal/pub/test/oauth2/with_a_malformed_credentials_authenticates_again_test.dart b/sdk/lib/_internal/pub_generated/test/oauth2/with_a_malformed_credentials_authenticates_again_test.dart
similarity index 81%
copy from sdk/lib/_internal/pub/test/oauth2/with_a_malformed_credentials_authenticates_again_test.dart
copy to sdk/lib/_internal/pub_generated/test/oauth2/with_a_malformed_credentials_authenticates_again_test.dart
index c0b2d53eadb942dd0013929a2d50d13cae3cc626..48600b5a701f3abf4c1cefdc4393431e3d9dc281 100644
--- a/sdk/lib/_internal/pub/test/oauth2/with_a_malformed_credentials_authenticates_again_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/oauth2/with_a_malformed_credentials_authenticates_again_test.dart
@@ -12,21 +12,22 @@ import 'utils.dart';
 
 main() {
   initConfig();
-  integration('with a malformed credentials.json, authenticates again and '
-      'saves credentials.json', () {
+  integration(
+      'with a malformed credentials.json, authenticates again and '
+          'saves credentials.json',
+      () {
     d.validPackage.create();
 
     var server = new ScheduledServer();
-    d.dir(cachePath, [
-      d.file('credentials.json', '{bad json')
-    ]).create();
+    d.dir(cachePath, [d.file('credentials.json', '{bad json')]).create();
 
     var pub = startPublish(server);
     confirmPublish(pub);
     authorizePub(pub, server, "new access token");
 
     server.handle('GET', '/api/packages/versions/new', (request) {
-      expect(request.headers,
+      expect(
+          request.headers,
           containsPair('authorization', 'Bearer new access token'));
 
       return new shelf.Response(200);
@@ -38,4 +39,4 @@ main() {
 
     d.credentialsFile(server, 'new access token').validate();
   });
-}
+}