Revert "[test.dart] Complain if there is non-utf8 formatted data in test output"

tests/standalone/io/non_utf8_output_test.dart

Index: tests/standalone/io/non_utf8_output_test.dart
diff --git a/tests/standalone/io/non_utf8_output_test.dart b/tests/standalone/io/non_utf8_output_test.dart
deleted file mode 100644
index 0e10a292e059b93e8a708d6fe5a7d1f7217588be..0000000000000000000000000000000000000000
--- a/tests/standalone/io/non_utf8_output_test.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
-// 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.
-
-// This test emits non-UTF8 formatted data.
-// It should have the test expectation: NonUtf8Output.
-
-import 'dart:io';
-
-main() {
-  String german = "German characters: aäbcdefghijklmnoöpqrsßtuüvwxyz";
-  stdout.add(german.runes.toList());
-}