Re-land "Format all multitests"

tests/language/const_map3_test.dart

Index: tests/language/const_map3_test.dart
diff --git a/tests/language/const_map3_test.dart b/tests/language/const_map3_test.dart
index df3f5d08b9e8a7447b82146b8bf04f00e6a6d0d7..0d799f0aa7da92e1b0de9dcca69084bdcca29d59 100644
--- a/tests/language/const_map3_test.dart
+++ b/tests/language/const_map3_test.dart
@@ -16,9 +16,9 @@ class B implements A {
 
 main() {
   // It is a compile-time error if the key type overrides operator ==.
-  var m = const { A.b: 42 };
+  var m = const {A.b: 42};
   Expect.equals(42, m[const B()]);
 
-  m = const { "foo": 99, A.b: 499 };
+  m = const {"foo": 99, A.b: 499};
   Expect.equals(499, m[const B()]);
 }