Fix analyzer hints and warnings in test/.

test/global/binstubs/does_not_warn_if_no_executables_test.dart

Index: test/global/binstubs/does_not_warn_if_no_executables_test.dart
diff --git a/test/global/binstubs/does_not_warn_if_no_executables_test.dart b/test/global/binstubs/does_not_warn_if_no_executables_test.dart
index ff814ac6b215785a8f909f209e3c593b459cedd1..2d9ce0b8326e82effe8e8405414dffaeb7d39f57 100644
--- a/test/global/binstubs/does_not_warn_if_no_executables_test.dart
+++ b/test/global/binstubs/does_not_warn_if_no_executables_test.dart
@@ -2,9 +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 'dart:io';
-
-import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;