dart2js: run dartfmt on tests

tests/compiler/dart2js_native/native_call_arity2_frog_test.dart

 // Copyright (c) 2011, 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";
 
 // This is a similar test to NativeCallArity1FrogTest, but makes sure
 // that subclasses also get the right number of arguments.
 
 @Native("A")
 class A {
-  int foo([x, y]) native;
+  int foo([x, y]) native ;
 }
 
 @Native("B")
 class B extends A {
-  int foo([x, y]) native;
+  int foo([x, y]) native ;
 }
 
-makeA() native;
-makeB() native;
+makeA() native ;
+makeB() native ;
 
 void 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 55 matching lines @@
   Expect.equals(1, b.foo(10));
   Expect.equals(2, b.foo(null, 20));
   Expect.throws(() => b.foo(10, 20, 30));
 }
 
 main() {
   setup();
   testDynamicContext();
   testStaticContext();
 }