Re-land "Format all multitests"

tests/language/mixin_supertype_subclass_test.dart

Index: tests/language/mixin_supertype_subclass_test.dart
diff --git a/tests/language/mixin_supertype_subclass_test.dart b/tests/language/mixin_supertype_subclass_test.dart
index 2ba3780f99cd897b337edb92716b545630ce96cd..f337ed04111ab67b85f4592daf603cfa5d1764cf 100644
--- a/tests/language/mixin_supertype_subclass_test.dart
+++ b/tests/language/mixin_supertype_subclass_test.dart
@@ -12,18 +12,24 @@
 //     superclass of A is not a subtype of S_static."
 
 class B {}
+
 class C {}
+
 class D {}
+
 class E extends B with C implements D {}
+
 class F extends E {}
+
 class A = E with M;
+
 class M
   extends B //# 01: ok
   extends C //# 02: static type warning
   extends D //# 03: ok
   extends E //# 04: ok
   extends F //# 05: static type warning
-  {}
+{}
 
 main() {
   new A();