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

sdk/lib/_internal/pub_generated/test/upgrade/git/do_not_upgrade_if_unneeded_test.dart

+// Copyright (c) 2012, 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.
+
+library pub_tests;
+
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+  integration(
+      "doesn't upgrade one locked Git package's dependencies if it's "
+          "not necessary",
+      () {
+    ensureGit();
+
+    d.git('foo.git', [d.libDir('foo'), d.libPubspec("foo", "1.0.0", deps: {
+        "foo-dep": {
+          "git": "../foo-dep.git"
+        }
+      })]).create();
+
+    d.git(
+        'foo-dep.git',
+        [d.libDir('foo-dep'), d.libPubspec('foo-dep', '1.0.0')]).create();
+
+    d.appDir({
+      "foo": {
+        "git": "../foo.git"
+      }
+    }).create();
+
+    pubGet();
+
+    d.dir(
+        packagesPath,
+        [
+            d.dir('foo', [d.file('foo.dart', 'main() => "foo";')]),
+            d.dir('foo-dep', [d.file('foo-dep.dart', 'main() => "foo-dep";')])]).validate();
+
+    d.git(
+        'foo.git',
+        [d.libDir('foo', 'foo 2'), d.libPubspec("foo", "1.0.0", deps: {
+        "foo-dep": {
+          "git": "../foo-dep.git"
+        }
+      })]).create();
+
+    d.git(
+        'foo-dep.git',
+        [d.libDir('foo-dep', 'foo-dep 2'), d.libPubspec('foo-dep', '1.0.0')]).commit();
+
+    pubUpgrade(args: ['foo']);
+
+    d.dir(
+        packagesPath,
+        [
+            d.dir('foo', [d.file('foo.dart', 'main() => "foo 2";')]),
+            d.dir(
+                'foo-dep',
+                [d.file('foo-dep.dart', 'main() => "foo-dep";')]),]).validate();
+  });
+}