Migrate test block 113 to Dart 2.0.

tests/language_2/generic_async_test.dart

Index: tests/language_2/generic_async_test.dart
diff --git a/tests/language_strong/generic_async_test.dart b/tests/language_2/generic_async_test.dart
similarity index 76%
rename from tests/language_strong/generic_async_test.dart
rename to tests/language_2/generic_async_test.dart
index b55df668ac3e4dd7ac923573f82dfdfa7f76cc35..8f86031c848788cfba4cbfddd7fc8f296d12d0e0 100644
--- a/tests/language_strong/generic_async_test.dart
+++ b/tests/language_2/generic_async_test.dart
@@ -6,8 +6,8 @@ import "package:expect/expect.dart";
 
 import 'dart:async';
 
-Future/*<T>*/ foo/*<T>*/(/*=T*/ x) async => x;
+Future<T> foo<T>(T x) async => x;
 
 main() async {
-  Expect.equals(1, await foo/*<int>*/(1));
+  Expect.equals(1, await foo<int>(1));
 }