dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/lookup_map/subclass_lookup_map_test.dart

Index: tests/compiler/dart2js_extra/lookup_map/subclass_lookup_map_test.dart
diff --git a/tests/compiler/dart2js_extra/lookup_map/subclass_lookup_map_test.dart b/tests/compiler/dart2js_extra/lookup_map/subclass_lookup_map_test.dart
index ebf74160243df6b9a64ead7a148946eb5333c156..43a3a770cf2ecf4ff6bafc7715be56884b11b7d2 100644
--- a/tests/compiler/dart2js_extra/lookup_map/subclass_lookup_map_test.dart
+++ b/tests/compiler/dart2js_extra/lookup_map/subclass_lookup_map_test.dart
@@ -4,15 +4,16 @@
 
 import 'package:lookup_map/lookup_map.dart';
 import 'package:expect/expect.dart';
-class A{}
-class B{}
+
+class A {}
+
+class B {}
+
 class S extends LookupMap {
   const S(list) : super(list);
 }
-const map = const S(const [
-    A, "the-text-for-A",
-    B, "the-text-for-B",
-]);
+
+const map = const S(const [A, "the-text-for-A", B, "the-text-for-B",]);
 
 main() {
   Expect.equals(map[A], "the-text-for-A");