Migrate test block 10 to Dart 2.0.

tests/corelib/int_parse_radix_bad_handler_test.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// 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.
-
-import "package:expect/expect.dart";
-
-void main() {
-  // If handleError isn't an unary function, and it's called, it also throws
-  // (either TypeError in checked mode, or some failure in unchecked mode).
-
-  // These are compile time errors for strong mode.
-  Expect.throws(() => int.parse("9", radix: 8, onError: "not a function"));
-  Expect.throws(() => int.parse("9", radix: 8, onError: () => 42));
-  Expect.throws(() => int.parse("9", radix: 8, onError: (v1, v2) => 42));
-}