Revert "Format all multitests"

tests/language/const_constructor_mixin3_test.dart

Index: tests/language/const_constructor_mixin3_test.dart
diff --git a/tests/language/const_constructor_mixin3_test.dart b/tests/language/const_constructor_mixin3_test.dart
index d92a8acb5ee40719972560a4d6c3e69cfd2602a0..0e46fe3c034de63473c17dec8fdf7709ec00bd1c 100644
--- a/tests/language/const_constructor_mixin3_test.dart
+++ b/tests/language/const_constructor_mixin3_test.dart
@@ -2,7 +2,8 @@
 // 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.
 
-class Mixin {}
+class Mixin {
+}
 
 class A {
   const A();
@@ -10,7 +11,7 @@ class A {
 
 class B extends A
     with Mixin //# 01: compile-time error
-{
+    {
   const B();
 }