dart2js: run dartfmt on tests

tests/compiler/dart2js_native/native_to_string_frog_test.dart

Index: tests/compiler/dart2js_native/native_to_string_frog_test.dart
diff --git a/tests/compiler/dart2js_native/native_to_string_frog_test.dart b/tests/compiler/dart2js_native/native_to_string_frog_test.dart
index 3b9a47a4336d8d59f0fb6728efe972ec8838b669..cff3ac48e90fea337081fad7a20992cbb4f780f6 100644
--- a/tests/compiler/dart2js_native/native_to_string_frog_test.dart
+++ b/tests/compiler/dart2js_native/native_to_string_frog_test.dart
@@ -7,14 +7,14 @@ import "package:expect/expect.dart";
 
 @Native("A")
 class A {}
-makeA() native;
+
+makeA() native ;
 
 void setup() native """
 function A() {}
 makeA = function(){return new A;};
 """;
 
-
 main() {
   setup();
   Expect.isTrue(makeA().toString() is String);