dart2js: run dartfmt on tests

tests/compiler/dart2js/field_update_test.dart

Index: tests/compiler/dart2js/field_update_test.dart
diff --git a/tests/compiler/dart2js/field_update_test.dart b/tests/compiler/dart2js/field_update_test.dart
index f5a93bae397e71dd00f90e095660f18d259afb41..c81422a0814b1f34115c413a7e4f956bf9623367 100644
--- a/tests/compiler/dart2js/field_update_test.dart
+++ b/tests/compiler/dart2js/field_update_test.dart
@@ -80,12 +80,11 @@ void main() {
 }
 """;
 
-
 main() {
   test(String code, Function f) {
     asyncTest(() => compileAll(code, disableInlining: true).then((generated) {
-      Expect.isTrue(f(generated));
-    }));
+          Expect.isTrue(f(generated));
+        }));
   }
 
   test(TEST_1, (generated) => generated.contains(r'return this.a++;'));