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

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

-// 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 'descriptor.dart' as d;
-import 'test_pub.dart';
-
-main() {
-  initConfig();
-  integration("includes root package's dev dependencies", () {
-    d.dir('foo', [d.libDir('foo'), d.libPubspec('foo', '0.0.1')]).create();
-
-    d.dir('bar', [d.libDir('bar'), d.libPubspec('bar', '0.0.1')]).create();
-
-    d.dir(appPath, [d.pubspec({
-        "name": "myapp",
-        "dev_dependencies": {
-          "foo": {
-            "path": "../foo"
-          },
-          "bar": {
-            "path": "../bar"
-          },
-        }
-      })]).create();
-
-    pubGet();
-
-    d.dir(
-        packagesPath,
-        [
-            d.dir("foo", [d.file("foo.dart", 'main() => "foo";')]),
-            d.dir("bar", [d.file("bar.dart", 'main() => "bar";')])]).validate();
-  });
-
-  integration("includes dev dependency's transitive dependencies", () {
-    d.dir('foo', [d.libDir('foo'), d.libPubspec('foo', '0.0.1', deps: {
-        "bar": {
-          "path": "../bar"
-        }
-      })]).create();
-
-    d.dir('bar', [d.libDir('bar'), d.libPubspec('bar', '0.0.1')]).create();
-
-    d.dir(appPath, [d.pubspec({
-        "name": "myapp",
-        "dev_dependencies": {
-          "foo": {
-            "path": "../foo"
-          }
-        }
-      })]).create();
-
-    pubGet();
-
-    d.dir(
-        packagesPath,
-        [
-            d.dir("foo", [d.file("foo.dart", 'main() => "foo";')]),
-            d.dir("bar", [d.file("bar.dart", 'main() => "bar";')])]).validate();
-  });
-
-  integration("ignores transitive dependency's dev dependencies", () {
-    d.dir('foo', [d.libDir('foo'), d.pubspec({
-        "name": "foo",
-        "version": "0.0.1",
-        "dev_dependencies": {
-          "bar": {
-            "path": "../bar"
-          }
-        }
-      })]).create();
-
-    d.dir('bar', [d.libDir('bar'), d.libPubspec('bar', '0.0.1')]).create();
-
-    d.dir(appPath, [d.appPubspec({
-        "foo": {
-          "path": "../foo"
-        }
-      })]).create();
-
-    pubGet();
-
-    d.dir(
-        packagesPath,
-        [
-            d.dir("foo", [d.file("foo.dart", 'main() => "foo";')]),
-            d.nothing("bar")]).validate();
-  });
-}