dart2js_native tests: Migrate 'native STRING' to JS-calls - part 2/2

tests/compiler/dart2js_native/jsobject_test.dart

 // Copyright (c) 2013, 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 'native_testing.dart';
 import 'dart:_js_helper' show setNativeSubclassDispatchRecord;
 import 'dart:_interceptors'
     show
         JSObject, // The interface, which may be re-exported by a
         // js-interop library.
         JavaScriptObject, //   The interceptor abstract class.
         PlainJavaScriptObject, //     The interceptor concrete class.
         UnknownJavaScriptObject, //     The interceptor concrete class.
         Interceptor;
 
 // Test for JavaScript objects from outside the Dart program.  Although we only
 // export the interface [JSObject] to user level code, this test makes sure we
 // can distinguish plain JavaScript objects from ones with a complex prototype.
 
 @Native('QQ')
 class Q {}
 
 makeA() native;
 makeB() native;
 makeQ() native;
 
-void setup() native r"""
+void setup() {
+  JS('', r"""
+(function(){
 makeA = function(){return {hello: 123};};
 
 function BB(){}
 makeB = function(){return new BB();};
 
 function QQ(){}
 makeQ = function(){return new QQ();};
 
 self.nativeConstructor(QQ);
-""";
+})()""");
+}
 
 class Is<T> {
   bool check(x) => x is T;
 }
 
 static_test() {
   var x = makeA();
   Expect.isTrue(x is JSObject);
   Expect.isTrue(x is JavaScriptObject);
   Expect.isTrue(x is PlainJavaScriptObject);
@@ skipping 46 matching lines @@
   Expect.isFalse(x.runtimeType == JSObject);
 }
 
 main() {
   nativeTesting();
   setup();
 
   dynamic_test();
   static_test();
 }