Fix analyzer hints and warnings in test/.

test/global/run/runs_script_in_unchecked_mode_test.dart

Index: test/global/run/runs_script_in_unchecked_mode_test.dart
diff --git a/test/global/run/runs_script_in_unchecked_mode_test.dart b/test/global/run/runs_script_in_unchecked_mode_test.dart
index 87ccc29b14d6fc965b8ca9238929ba077b76de7e..744aa9a1e31574a1562fde009af7f1a11ddf2a30 100644
--- a/test/global/run/runs_script_in_unchecked_mode_test.dart
+++ b/test/global/run/runs_script_in_unchecked_mode_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';