Format all tests.

tests/language/mixin_type_parameters_mixin_test.dart

Index: tests/language/mixin_type_parameters_mixin_test.dart
diff --git a/tests/language/mixin_type_parameters_mixin_test.dart b/tests/language/mixin_type_parameters_mixin_test.dart
index d5ddd6dc8e189eadb63dce48ebe856ecc534eb68..ac3808828cd3d189103d4a79cf2b7a3a98b6fe13 100644
--- a/tests/language/mixin_type_parameters_mixin_test.dart
+++ b/tests/language/mixin_type_parameters_mixin_test.dart
@@ -37,8 +37,7 @@ class M<T> {
   }
 }
 
-class S {
-}
+class S {}
 
 class C0<T> = S with M;
 class C1<T> = S with M<T>;