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

sdk/lib/_internal/pub_generated/test/build/includes_dart_files_in_debug_mode_test.dart

Index: sdk/lib/_internal/pub_generated/test/build/includes_dart_files_in_debug_mode_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/build/includes_dart_files_in_debug_mode_test.dart b/sdk/lib/_internal/pub_generated/test/build/includes_dart_files_in_debug_mode_test.dart
deleted file mode 100644
index ac7a293c6287b0667b3a8358af3839fa50bd9552..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/build/includes_dart_files_in_debug_mode_test.dart
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright (c) 2013, 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.
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-
-  integration("includes Dart files in debug mode", () {
-    d.dir(
-        appPath,
-        [
-            d.appPubspec(),
-            d.dir(
-                'web',
-                [
-                    d.file('file1.dart', 'var main = () => print("hello");'),
-                    d.file('file2.dart', 'void main(arg1, arg2, arg3) => print("hello");'),
-                    d.file('file3.dart', 'class Foo { void main() => print("hello"); }'),
-                    d.file('file4.dart', 'var foo;')])]).create();
-
-    schedulePub(
-        args: ["build", "--mode", "debug"],
-        output: new RegExp(r'Built \d+ files to "build".'));
-
-    d.dir(
-        appPath,
-        [
-            d.dir(
-                'build',
-                [
-                    d.dir(
-                        'web',
-                        [
-                            d.nothing('file1.dart.js'),
-                            d.matcherFile('file1.dart', isNot(isEmpty)),
-                            d.nothing('file2.dart.js'),
-                            d.matcherFile('file2.dart', isNot(isEmpty)),
-                            d.nothing('file3.dart.js'),
-                            d.matcherFile('file3.dart', isNot(isEmpty)),
-                            d.nothing('file4.dart.js'),
-                            d.matcherFile('file4.dart', isNot(isEmpty))])])]).validate();
-  });
-}