Fix analyzer hints and warnings in test/.

test/global/binstubs/no_executables_flag_test.dart

Index: test/global/binstubs/no_executables_flag_test.dart
diff --git a/test/global/binstubs/no_executables_flag_test.dart b/test/global/binstubs/no_executables_flag_test.dart
index e5ab3d40d74472447a2546b574b9d97522e268da..e7814997211244a3d72fb90620035de9058634a7 100644
--- a/test/global/binstubs/no_executables_flag_test.dart
+++ b/test/global/binstubs/no_executables_flag_test.dart
@@ -2,8 +2,6 @@
 // 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:scheduled_test/scheduled_test.dart';
-
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';