Format all tests.

tests/language_strong/mixin_type_parameters_mixin_extends_test.dart

Index: tests/language_strong/mixin_type_parameters_mixin_extends_test.dart
diff --git a/tests/language_strong/mixin_type_parameters_mixin_extends_test.dart b/tests/language_strong/mixin_type_parameters_mixin_extends_test.dart
index 72952baf23ea2c80ba541c841fdda49485d7ef20..b1e9d3ffadb47663fb64cb46e8fb162ca1c94e01 100644
--- a/tests/language_strong/mixin_type_parameters_mixin_extends_test.dart
+++ b/tests/language_strong/mixin_type_parameters_mixin_extends_test.dart
@@ -37,13 +37,15 @@ class M<T> {
   }
 }
 
-class S {
-}
+class S {}
+
+class C0<T> extends S with M {}
+
+class C1<T> extends S with M<T> {}
+
+class C2<T> extends S with M<int> {}
 
-class C0<T> extends S with M { }
-class C1<T> extends S with M<T> { }
-class C2<T> extends S with M<int> { }
-class C3 extends S with M<String> { }
+class C3 extends S with M<String> {}
 
 main() {
   var c0 = new C0();