Revert "TEMPORARY - Validate fix for 16994 with some caveats"

tests/standalone/io/platform_executable_script.dart

Index: tests/standalone/io/platform_executable_script.dart
diff --git a/tests/standalone/io/platform_executable_script.dart b/tests/standalone/io/platform_executable_script.dart
deleted file mode 100644
index 5056ade6df1d071994ef6c8b7550bf4165fc25c5..0000000000000000000000000000000000000000
--- a/tests/standalone/io/platform_executable_script.dart
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright (c) 2012, 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.
-
-import 'dart:io';
-
-void main() => print(Platform.executable);