[gardening] Cleanup stress test list.

Follow-up to https://github.com/dart-lang/sdk/commit/1d684cdfb0277ee2848571645bc72cf7cc0843a4 which deleted the test.

Fixes https://github.com/dart-lang/sdk/issues/59705

Change-Id: I11ddaacf75af2234e6228f80f569b47d3f3b9490
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/400360
Commit-Queue: Alexander Aprelev <aam@google.com>
Reviewed-by: Jessy Yameogo <yjessy@google.com>
diff --git a/runtime/tests/concurrency/stress_test_list.json b/runtime/tests/concurrency/stress_test_list.json
index 2d84888..95ece45 100644
--- a/runtime/tests/concurrency/stress_test_list.json
+++ b/runtime/tests/concurrency/stress_test_list.json
@@ -600,7 +600,6 @@
   "../../../tests/language/abstract/method_test.dart",
   "../../../tests/language/abstract/object_method_test.dart",
   "../../../tests/language/abstract/override_adds_optional_args_test.dart",
-  "../../../tests/language/abstract/syntax_runtime_test.dart",
   "../../../tests/language/accessor_conflict/export2_test.dart",
   "../../../tests/language/accessor_conflict/export_test.dart",
   "../../../tests/language/accessor_conflict/import2_test.dart",