Format all tests.

tests/language_strong/generic_field_mixin2_test.dart

Index: tests/language_strong/generic_field_mixin2_test.dart
diff --git a/tests/language_strong/generic_field_mixin2_test.dart b/tests/language_strong/generic_field_mixin2_test.dart
index 74132549ca9b05ca33b21d55979f75cce38e8630..99e2d926a8ee22d0645759f5f6fc353d90d27560 100644
--- a/tests/language_strong/generic_field_mixin2_test.dart
+++ b/tests/language_strong/generic_field_mixin2_test.dart
@@ -9,7 +9,9 @@ import 'package:expect/expect.dart';
 class M<T> {
   var field = T;
 }
+
 class A<U> {}
+
 class C1<V> = Object with M<V>;
 class C2 = Object with M<int>;
 class C3 = Object with M<String>;
@@ -21,4 +23,4 @@ main() {
   Expect.equals(int, new C2().field);
 
   Expect.equals(String, new C3().field);
-}
+}