dart2js: run dartfmt on tests

tests/compiler/dart2js/type_promotion_test.dart

Index: tests/compiler/dart2js/type_promotion_test.dart
diff --git a/tests/compiler/dart2js/type_promotion_test.dart b/tests/compiler/dart2js/type_promotion_test.dart
index b391cf929962f3d33c772d5d3c82837c8271a2a7..a7794e0b1f10c51d7ec893c8ec924da6613af5f5 100644
--- a/tests/compiler/dart2js/type_promotion_test.dart
+++ b/tests/compiler/dart2js/type_promotion_test.dart
@@ -13,15 +13,16 @@ import 'warnings_checker.dart';
 /// can contain a list of line numbers for keys 'missing' and 'unexpected' for
 /// the warnings of each category.
 const Map<String, dynamic> TESTS = const {
-    'language/type_promotion_assign_test.dart': null,
-    'language/type_promotion_closure_test.dart': null,
-    'language/type_promotion_functions_test.dart':
-        const {'missing': const [62, 63, 64]}, // Issue 14933.
-    'language/type_promotion_local_test.dart': null,
-    'language/type_promotion_logical_and_test.dart': null,
-    'language/type_promotion_more_specific_test.dart': null,
-    'language/type_promotion_multiple_test.dart': null,
-    'language/type_promotion_parameter_test.dart': null,
+  'language/type_promotion_assign_test.dart': null,
+  'language/type_promotion_closure_test.dart': null,
+  'language/type_promotion_functions_test.dart': const {
+    'missing': const [62, 63, 64]
+  }, // Issue 14933.
+  'language/type_promotion_local_test.dart': null,
+  'language/type_promotion_logical_and_test.dart': null,
+  'language/type_promotion_more_specific_test.dart': null,
+  'language/type_promotion_multiple_test.dart': null,
+  'language/type_promotion_parameter_test.dart': null,
 };
 
 void main() {