Re-land "Format all multitests"

tests/language/const_for_in_variable_test.dart

Index: tests/language/const_for_in_variable_test.dart
diff --git a/tests/language/const_for_in_variable_test.dart b/tests/language/const_for_in_variable_test.dart
index 7298de9a68e6f7fc635685432bdcf16eeb7e570b..dc12639adfcc1a6885d9b637c5bed7da48982bce 100644
--- a/tests/language/const_for_in_variable_test.dart
+++ b/tests/language/const_for_in_variable_test.dart
@@ -3,10 +3,10 @@
 // BSD-style license that can be found in the LICENSE file.
 
 main() {
-  for(
+  for (
       const //                          //# 01: compile-time error
       final //                          //# 02: ok
       int x in const [1, 2, 3]) {
     break;
   }
-}
+}