Add second argument to Future error handlers.

tests/lib/async/zone_run_guarded_test.dart

Index: tests/lib/async/zone_run_guarded_test.dart
diff --git a/tests/lib/async/zone_run_guarded_test.dart b/tests/lib/async/zone_run_guarded_test.dart
index 42faaeb8f9ca2754e311a4c4ec13e1579d4334e4..5bb3e18c9394e3d7b151349db07c0f993a545174 100644
--- a/tests/lib/async/zone_run_guarded_test.dart
+++ b/tests/lib/async/zone_run_guarded_test.dart
@@ -23,10 +23,11 @@ main() {
         events.add("forked.run");
         return parent.run(origin, f);
       },
-      handleUncaughtError: (Zone self, ZoneDelegate parent, Zone origin, e) {
+      handleUncaughtError:
+          (Zone self, ZoneDelegate parent, Zone origin, error, stackTrace) {
         Expect.identical(Zone.ROOT, Zone.current);
         Expect.identical(forked, origin);
-        events.add("forked.handleUncaught $e");
+        events.add("forked.handleUncaught $error");
         return 499;
       }));