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

sdk/lib/_internal/pub_generated/test/global/binstubs/creates_executables_in_pubspec_test.dart

+// Copyright (c) 2014, 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("creates binstubs for each executable in the pubspec", () {
+    servePackages((builder) {
+      builder.serve("foo", "1.0.0", pubspec: {
+        "executables": {
+          "one": null,
+          "two-renamed": "second"
+        }
+      },
+          contents: [
+              d.dir(
+                  "bin",
+                  [
+                      d.file("one.dart", "main(args) => print('one');"),
+                      d.file("second.dart", "main(args) => print('two');"),
+                      d.file("nope.dart", "main(args) => print('nope');")])]);
+    });
+
+    schedulePub(
+        args: ["global", "activate", "foo"],
+        output: contains("Installed executables one and two-renamed."));
+
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                "bin",
+                [
+                    d.matcherFile(binStubName("one"), contains("one")),
+                    d.matcherFile(binStubName("two-renamed"), contains("second")),
+                    d.nothing(binStubName("two")),
+                    d.nothing(binStubName("nope"))])]).validate();
+  });
+}