Regenerate pub sources.

sdk/lib/_internal/pub_generated/lib/src/validator/dependency_override.dart

Index: sdk/lib/_internal/pub_generated/lib/src/validator/dependency_override.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/validator/dependency_override.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/dependency_override.dart
index c233356a7a25037ec0f71a1ccf6bce30af9112cd..c01b27065d3350b04e22aaf145e1bbff0253a32d 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/validator/dependency_override.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator/dependency_override.dart
@@ -1,9 +1,20 @@
+// 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.validator.dependency_override;
+
 import 'dart:async';
+
 import '../entrypoint.dart';
 import '../validator.dart';
+
+/// A validator that validates a package's dependencies overrides (or the
+/// absence thereof).
 class DependencyOverrideValidator extends Validator {
-  DependencyOverrideValidator(Entrypoint entrypoint) : super(entrypoint);
+  DependencyOverrideValidator(Entrypoint entrypoint)
+      : super(entrypoint);
+
   Future validate() {
     if (entrypoint.root.dependencyOverrides.isNotEmpty) {
       errors.add(