Re-land "Format all multitests"

tests/language/compile_time_constant_c_test.dart

Index: tests/language/compile_time_constant_c_test.dart
diff --git a/tests/language/compile_time_constant_c_test.dart b/tests/language/compile_time_constant_c_test.dart
index 1a84633c367c80f5bc8a7db1ff375dfce2c17b88..3ebc2e7e3671038a66a953fd32c491128d889d9e 100644
--- a/tests/language/compile_time_constant_c_test.dart
+++ b/tests/language/compile_time_constant_c_test.dart
@@ -2,9 +2,7 @@
 // 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.
 
-const m0 = const {
-  499: 400 + 99
-};
+const m0 = const {499: 400 + 99};
 const m1 = const {
   "foo" + "bar": 42 //           //# 01: ok
 };