Remove windows debug print and trace shutdown on some tests

tests/standalone/io/http_basic_test.dart

Index: tests/standalone/io/http_basic_test.dart
diff --git a/tests/standalone/io/http_basic_test.dart b/tests/standalone/io/http_basic_test.dart
index f30a32b7ada8507e7a1912f1280629c5fdb7b6a9..266dd8feba5ca12063051dd6591e4b4fc311a355 100644
--- a/tests/standalone/io/http_basic_test.dart
+++ b/tests/standalone/io/http_basic_test.dart
@@ -2,10 +2,10 @@
 // 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.
 //
-// VMOptions=
-// VMOptions=--short_socket_read
-// VMOptions=--short_socket_write
-// VMOptions=--short_socket_read --short_socket_write
+// VMOptions=--trace_shutdown
+// VMOptions=--trace_shutdown --short_socket_read
+// VMOptions=--trace_shutdown --short_socket_write
+// VMOptions=--trace_shutdown --short_socket_read --short_socket_write
 
 import "package:expect/expect.dart";
 import "dart:isolate";