Re-land "Format all multitests"

tests/language/const_switch2_test.dart

Index: tests/language/const_switch2_test.dart
diff --git a/tests/language/const_switch2_test.dart b/tests/language/const_switch2_test.dart
index 77638c0a784a792cb449703b88d83ec56d9fcfec..3cf517715258867cac378f59a26c5e0083fbb461 100644
--- a/tests/language/const_switch2_test.dart
+++ b/tests/language/const_switch2_test.dart
@@ -5,11 +5,11 @@
 import 'package:expect/expect.dart';
 
 int main() {
-  var a = [1,2,3][2];
+  var a = [1, 2, 3][2];
   switch (a) {
     case 0.0: //           //# 01: compile-time error
       print("illegal"); // //# 01: continued
     case 1:
       print("OK");
   }
-}
+}