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

tests/compiler/dart2js_native/subclassing_1_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 findInterceptorForType;
 
 // Test that subclasses of native classes can be defined by setting the dispatch
 // record.
@@ skipping 11 matching lines @@
 B makeB1() native;
 B makeB2() native;
 B makeC() native;
 
 @Creates('=Object')
 getBPrototype() native;
 
 @Creates('=Object')
 getCPrototype() native;
 
-void setup() native r"""
-function A() {}
-function B() {}
-function C() {}
-makeA = function(){return new A;};
-makeB1 = function(){return new B;};
-makeB2 = function(){return new B;};
-makeC = function(){return new C;};
+void setup() {
+  JS('', r"""
+(function(){
+  function A() {}
+  function B() {}
+  function C() {}
+  makeA = function(){return new A()};
+  makeB1 = function(){return new B()};
+  makeB2 = function(){return new B()};
+  makeC = function(){return new C()};
 
-getBPrototype = function(){return B.prototype;};
-getCPrototype = function(){return C.prototype;};
-""";
+  getBPrototype = function(){return B.prototype;};
+  getCPrototype = function(){return C.prototype;};
+})()""");
+}
 
 main() {
   nativeTesting();
   setup();
 
   setNativeSubclassDispatchRecord(getBPrototype(), findInterceptorForType(B));
   setNativeSubclassDispatchRecord(getCPrototype(), findInterceptorForType(B));
 
   B b1 = makeB1();
   Expect.equals('1,B', b1.foo(1));
 
   B b2 = makeB2();
   Expect.equals('2,B', b2.foo(2));
 
   B b3 = makeC();
   Expect.equals('3,B', b3.foo(3));
 }