dart2js: run dartfmt on tests

tests/compiler/dart2js/js_constant_test.dart

Index: tests/compiler/dart2js/js_constant_test.dart
diff --git a/tests/compiler/dart2js/js_constant_test.dart b/tests/compiler/dart2js/js_constant_test.dart
index 6165cfa8a59fb12073da751707b424ab533bff05..9a7924c35fecbfe4479fde9327c248527cb34eb8 100644
--- a/tests/compiler/dart2js/js_constant_test.dart
+++ b/tests/compiler/dart2js/js_constant_test.dart
@@ -16,7 +16,6 @@ const String TEST_1 = r"""
   }
 """;
 
-
 main() {
   RegExp directivePattern = new RegExp(
       //      \1                    \2        \3
@@ -46,7 +45,5 @@ main() {
     });
   }
 
-  asyncTest(() => Future.wait([
-    check(TEST_1),
-  ]));
+  asyncTest(() => Future.wait([check(TEST_1),]));
 }