Revert "Add native_testing library to mock @Native classes"

tests/compiler/dart2js_native/native_field_name_test.dart

Index: tests/compiler/dart2js_native/native_field_name_test.dart
diff --git a/tests/compiler/dart2js_native/native_field_name_test.dart b/tests/compiler/dart2js_native/native_field_name_test.dart
index 6269e4f22011d489aa019d1656b2e407bb48b491..b0001a8d63b0b2d0f9517381a667cbcbcdc50a48 100644
--- a/tests/compiler/dart2js_native/native_field_name_test.dart
+++ b/tests/compiler/dart2js_native/native_field_name_test.dart
@@ -2,7 +2,8 @@
 // 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";
+import "package:expect/expect.dart";
 
 // Check that native fields are not incorrectly renamed.
 
@@ -28,7 +29,7 @@ function setter(x) {
 
 function A(){
   var a = Object.create(
-      { constructor: A },
+      { constructor: { name: 'A'}},
       { myLongPropertyName: { get: getter,
                               set: setter,
                               configurable: false,
@@ -40,14 +41,11 @@ function A(){
 }
 
 makeA = function(){return new A;};
-
-self.nativeConstructor(A);
 """;
 
-/*A*/ makeA() native ;
+A makeA() native ;
 
 main() {
-  nativeTesting();
   setup();
   var a = makeA();
   a.myLongPropertyName = 21;