Use "package:" imports for pub.

test/validator/utf8_readme_test.dart

Index: test/validator/utf8_readme_test.dart
diff --git a/test/validator/utf8_readme_test.dart b/test/validator/utf8_readme_test.dart
index 60e65fdbd44fa7c3dc49c4d168c8eeb7157fe9e9..bf0273f61d3bcebc28227623371da6c8049aeaab 100644
--- a/test/validator/utf8_readme_test.dart
+++ b/test/validator/utf8_readme_test.dart
@@ -2,11 +2,11 @@
 // 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:pub/src/entrypoint.dart';
+import 'package:pub/src/validator.dart';
+import 'package:pub/src/validator/utf8_readme.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
-import '../../lib/src/entrypoint.dart';
-import '../../lib/src/validator.dart';
-import '../../lib/src/validator/utf8_readme.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';