dart2js: run dartfmt on tests

tests/compiler/dart2js_native/native_null_frog_test.dart

Index: tests/compiler/dart2js_native/native_null_frog_test.dart
diff --git a/tests/compiler/dart2js_native/native_null_frog_test.dart b/tests/compiler/dart2js_native/native_null_frog_test.dart
index 7a9268413fddbf587d2da532b679dbad9b831172..d554a52a7b172f748c5103e43286df105d929eb0 100644
--- a/tests/compiler/dart2js_native/native_null_frog_test.dart
+++ b/tests/compiler/dart2js_native/native_null_frog_test.dart
@@ -7,16 +7,15 @@ import "package:expect/expect.dart";
 
 // Test for values of some basic types.
 
-
 @Native("A")
 class A {
-  returnNull() native;
-  returnUndefined() native;
-  returnEmptyString() native;
-  returnZero() native;
+  returnNull() native ;
+  returnUndefined() native ;
+  returnEmptyString() native ;
+  returnZero() native ;
 }
 
-A makeA() native;
+A makeA() native ;
 
 void setup() native """
 function A() {}
@@ -27,7 +26,6 @@ A.prototype.returnZero = function() { return 0; };
 makeA = function(){return new A;};
 """;
 
-
 main() {
   setup();
   A a = makeA();