Use "package:" imports for pub.

test/global/run/implicit_executable_name_test.dart

Index: test/global/run/implicit_executable_name_test.dart
diff --git a/test/global/run/implicit_executable_name_test.dart b/test/global/run/implicit_executable_name_test.dart
index da68c8e1c182b789dd49cf844f03255e51c7323b..18b2fcb7a1d7dfe167b9effe6cbd09dc7c846451 100644
--- a/test/global/run/implicit_executable_name_test.dart
+++ b/test/global/run/implicit_executable_name_test.dart
@@ -2,7 +2,8 @@
 // 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/exit_codes.dart' as exit_codes;
+import 'package:pub/src/exit_codes.dart' as exit_codes;
+
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';