Revert "Add native_testing library to mock @Native classes"

tests/compiler/dart2js_native/runtimetype_test.dart

Index: tests/compiler/dart2js_native/runtimetype_test.dart
diff --git a/tests/compiler/dart2js_native/runtimetype_test.dart b/tests/compiler/dart2js_native/runtimetype_test.dart
index babdc1168d21092f7fb8b2b78f06f5e249be43cc..4667eca8d8808d984ee3f5faa516c30ea0e2914e 100644
--- a/tests/compiler/dart2js_native/runtimetype_test.dart
+++ b/tests/compiler/dart2js_native/runtimetype_test.dart
@@ -2,7 +2,9 @@
 // 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 "package:expect/expect.dart";
+import "dart:_js_helper";
+import 'dart:_foreign_helper' show JS;
 
 // Test to see runtimeType works on native classes and does not use the native
 // constructor name.
@@ -31,9 +33,6 @@ inherits(TAGY, TAGX);
 
 makeA = function(){return new TAGX};
 makeB = function(){return new TAGY};
-
-self.nativeConstructor(TAGX);
-self.nativeConstructor(TAGY);
 """;
 
 testDynamicContext() {
@@ -59,7 +58,6 @@ testStaticContext() {
 }
 
 main() {
-  nativeTesting();
   setup();
 
   testDynamicContext();