Use "package:" imports for pub.

test/global/binstubs/unknown_explicit_executable_test.dart

Index: test/global/binstubs/unknown_explicit_executable_test.dart
diff --git a/test/global/binstubs/unknown_explicit_executable_test.dart b/test/global/binstubs/unknown_explicit_executable_test.dart
index ae1e0e0f3978dd17d6311f6974d79454ee8e4c04..731f2084238e01d54daeb6f9fbd4c949aa475156 100644
--- a/test/global/binstubs/unknown_explicit_executable_test.dart
+++ b/test/global/binstubs/unknown_explicit_executable_test.dart
@@ -2,9 +2,9 @@
 // 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/exit_codes.dart' as exit_codes;
 import 'package:scheduled_test/scheduled_stream.dart';
 
-import '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';