dart2js: run dartfmt on tests

tests/compiler/dart2js_native/native_no_such_method_exception2_frog_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:_js_helper";
 import "package:expect/expect.dart";
 
 @Native("A")
-class A {
-}
+class A {}
 
 @Native("B")
 class B extends A {
-  foo() native;
+  foo() native ;
 }
 
-makeA() native;
-makeB() native;
+makeA() native ;
+makeB() native ;
 
 setup() native """
 function inherits(child, parent) {
   if (child.prototype.__proto__) {
     child.prototype.__proto__ = parent.prototype;
   } else {
     function tmp() {};
     tmp.prototype = parent.prototype;
     child.prototype = new tmp();
     child.prototype.constructor = child;
@@ skipping 14 matching lines @@
   try {
     a.foo();
   } on NoSuchMethodError catch (e) {
     exception = e;
   }
   Expect.isNotNull(exception);
 
   var b = makeB();
   Expect.equals(42, b.foo());
 }