Fix mirrors/invocation_fuzz_test.

tests/lib/mirrors/invocation_fuzz_test.dart

Index: tests/lib/mirrors/invocation_fuzz_test.dart
diff --git a/tests/lib/mirrors/invocation_fuzz_test.dart b/tests/lib/mirrors/invocation_fuzz_test.dart
index 61e7626224f08564b3340f73a52d0917abb7353d..4afd372be2df7e8591ffa8d40601f691c729f535 100644
--- a/tests/lib/mirrors/invocation_fuzz_test.dart
+++ b/tests/lib/mirrors/invocation_fuzz_test.dart
@@ -37,6 +37,10 @@ var blacklist = [
   // TODO(15274): Fix them and remove from blacklist.
   'dart.io.SystemEncoding.decode',  // Windows only
   'dart.io.SystemEncoding.encode',  // Windows only
+
+  // Don't call private methods in dart.async as they may circumvent the zoned
+  // error handling below.
+  new RegExp(r"^dart\.async\._.*$"),
 ];
 
 bool isBlacklisted(Symbol qualifiedSymbol) {