Fix analyzer hints and warnings in test/.

test/global/binstubs/binstub_runs_executable_test.dart

Index: test/global/binstubs/binstub_runs_executable_test.dart
diff --git a/test/global/binstubs/binstub_runs_executable_test.dart b/test/global/binstubs/binstub_runs_executable_test.dart
index 68da8cce6f5e4bf370786492261f7c7aca56725c..1ca70b2348cd91960c128f3a8b607b7829b7442e 100644
--- a/test/global/binstubs/binstub_runs_executable_test.dart
+++ b/test/global/binstubs/binstub_runs_executable_test.dart
@@ -2,11 +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 'dart:io';
-
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_process.dart';
-import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';