Re-land "Format all multitests"

tests/language_strong/const_map2_test.dart

Index: tests/language_strong/const_map2_test.dart
diff --git a/tests/language_strong/const_map2_test.dart b/tests/language_strong/const_map2_test.dart
index e4bb56d6d1f7153ca277480a57e9bad66e6a32b8..bc0cbb984633cf3fa33dac634bd2cf220ba5e126 100644
--- a/tests/language_strong/const_map2_test.dart
+++ b/tests/language_strong/const_map2_test.dart
@@ -21,9 +21,9 @@ confuse(x) {
 
 main() {
   // It is a compile-time error if the key type overrides operator ==.
-  var m = const { const A(): 42 };
+  var m = const {const A(): 42};
   Expect.equals(42, m[confuse(const B())]);
 
-  m = const { "foo": 99, const A(): 499 };
+  m = const {"foo": 99, const A(): 499};
   Expect.equals(499, m[confuse(const B())]);
 }