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

tests/compiler/dart2js_native/native_field_name_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 'native_testing.dart';
 
 // Check that native fields are not incorrectly renamed.
 
 @Native("A")
 class A {
   int myLongPropertyName;
   int getValue;
 
   int method(int z) => myLongPropertyName;
 }
 
 // This code is inside the setup function, so the function names are not
 // accessible, but the makeA variable is global through the magic of JS scoping.
 // The contents of this are of course not analyzable by the compiler.
-void setup() native r"""
-function getter() {
-  return ++this.getValue;
+void setup() {
+  JS('', r"""
+(function(){
+  function getter() {
+    return ++this.getValue;
+  }
+
+  function setter(x) {
+    this.getValue += 10;
+  }
+
+  function A(){
+    var a = Object.create(
+        { constructor: A },
+        { myLongPropertyName: { get: getter,
+                                set: setter,
+                                configurable: false,
+                                writeable: false
+                              }
+        });
+    a.getValue = 0;
+    return a;
+  }
+
+  makeA = function(){return new A()};
+
+  self.nativeConstructor(A);
+})()""");
 }
 
-function setter(x) {
-  this.getValue += 10;
-}
-
-function A(){
-  var a = Object.create(
-      { constructor: A },
-      { myLongPropertyName: { get: getter,
-                              set: setter,
-                              configurable: false,
-                              writeable: false
-                            }
-      });
-  a.getValue = 0;
-  return a;
-}
-
-makeA = function(){return new A;};
-
-self.nativeConstructor(A);
-""";
-
 /*A*/ makeA() native;
 
 main() {
   nativeTesting();
   setup();
   var a = makeA();
   a.myLongPropertyName = 21;
   int gotten = a.myLongPropertyName;
   Expect.equals(11, gotten);
 
   var a2 = makeA();
   if (a2 is A) {
     // Inside this 'if' the compiler knows that a2 is an A, so it is tempted
     // to access myLongPropertyName directly, using its minified name.  But
     // renaming of native properties can only work using getters and setters
     // that access the original name.
     a2.myLongPropertyName = 21;
     int gotten = a2.myLongPropertyName;
     Expect.equals(11, gotten);
   }
 }