Format all tests.

tests/language/async_backwards_compatibility_2_test.dart

Index: tests/language/async_backwards_compatibility_2_test.dart
diff --git a/tests/language/async_backwards_compatibility_2_test.dart b/tests/language/async_backwards_compatibility_2_test.dart
index 4f9074f3eafc7f1433be335402d556b0a835da9b..7fe1a9e11df5ed373f3ec039fec70da3aa28d152 100644
--- a/tests/language/async_backwards_compatibility_2_test.dart
+++ b/tests/language/async_backwards_compatibility_2_test.dart
@@ -2,7 +2,9 @@
 // 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.
 
-int get async { return 1; }
+int get async {
+  return 1;
+}
 
 class A {
   async() => null;