bpo-40275: Use new test.support helper submodules in tests (GH-21449)

diff --git a/Lib/test/test_trace.py b/Lib/test/test_trace.py
index c03982b..7547855 100644
--- a/Lib/test/test_trace.py
+++ b/Lib/test/test_trace.py
@@ -1,6 +1,7 @@
 import os
 import sys
-from test.support import TESTFN, TESTFN_UNICODE, FS_NONASCII, rmtree, unlink, captured_stdout
+from test.support import captured_stdout
+from test.support.os_helper import (TESTFN, rmtree, unlink)
 from test.support.script_helper import assert_python_ok, assert_python_failure
 import textwrap
 import unittest