Migrate test block 113 to Dart 2.0.

tests/language_strong/generic_async_test.dart

Index: tests/language_strong/generic_async_test.dart
diff --git a/tests/language_strong/generic_async_test.dart b/tests/language_strong/generic_async_test.dart
deleted file mode 100644
index b55df668ac3e4dd7ac923573f82dfdfa7f76cc35..0000000000000000000000000000000000000000
--- a/tests/language_strong/generic_async_test.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2016, 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";
-
-import 'dart:async';
-
-Future/*<T>*/ foo/*<T>*/(/*=T*/ x) async => x;
-
-main() async {
-  Expect.equals(1, await foo/*<int>*/(1));
-}