Use "package:" imports for pub.

test/validator/dependency_override_test.dart

Index: test/validator/dependency_override_test.dart
diff --git a/test/validator/dependency_override_test.dart b/test/validator/dependency_override_test.dart
index 6f336a27380cbc01ee7c1c960337ef008fb20f7d..ae3e71cebb2408732a9036bb62214a9d8caa9f32 100644
--- a/test/validator/dependency_override_test.dart
+++ b/test/validator/dependency_override_test.dart
@@ -2,9 +2,10 @@
 // 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 '../../lib/src/entrypoint.dart';
-import '../../lib/src/validator.dart';
-import '../../lib/src/validator/dependency_override.dart';
+import 'package:pub/src/entrypoint.dart';
+import 'package:pub/src/validator.dart';
+import 'package:pub/src/validator/dependency_override.dart';
+
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';