Regenerate pub sources.

sdk/lib/_internal/pub_generated/test/downgrade/dry_run_does_not_apply_changes_test.dart

Index: sdk/lib/_internal/pub_generated/test/downgrade/dry_run_does_not_apply_changes_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/downgrade/dry_run_does_not_apply_changes_test.dart b/sdk/lib/_internal/pub_generated/test/downgrade/dry_run_does_not_apply_changes_test.dart
index 9786b223ec92d80a7be6e25ef13106fd352a7730..3b0c9d1e4a4e17d31a5a6cdd998829c2908b8bb2 100644
--- a/sdk/lib/_internal/pub_generated/test/downgrade/dry_run_does_not_apply_changes_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/downgrade/dry_run_does_not_apply_changes_test.dart
@@ -1,8 +1,14 @@
+// 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:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_test.dart';
+
 import '../../lib/src/io.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
+
 main() {
   initConfig();
   integration("--dry-run shows report but does not apply changes", () {
@@ -10,24 +16,33 @@ main() {
       builder.serve("foo", "1.0.0");
       builder.serve("foo", "2.0.0");
     });
+
+    // Create the first lockfile.
     d.appDir({
       "foo": "2.0.0"
     }).create();
+
     pubGet();
+
+    // Change the pubspec.
     d.appDir({
       "foo": "any"
     }).create();
+
+    // Also delete the "packages" directory.
     schedule(() {
       deleteEntry(path.join(sandboxDir, appPath, "packages"));
     });
+
+    // Do the dry run.
     pubDowngrade(
         args: ["--dry-run"],
         output: allOf(
             [contains("< foo 1.0.0"), contains("Would change 1 dependency.")]));
-    d.dir(
-        appPath,
-        [
-            d.matcherFile("pubspec.lock", contains("2.0.0")),
-            d.nothing("packages")]).validate();
+
+    d.dir(appPath, [// The lockfile should be unmodified.
+      d.matcherFile("pubspec.lock", contains("2.0.0")),
+          // The "packages" directory should not have been regenerated.
+      d.nothing("packages")]).validate();
   });
 }