Revert "Add native_testing library to mock @Native classes"

tests/compiler/dart2js_native/native_method_rename1_frog_test.dart

Index: tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
diff --git a/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart b/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
index 4d8ead2bbf90af6b4293218f437fd699e728b49d..e38cd2834094d601e43482b6228e7f066611dd20 100644
--- a/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
+++ b/tests/compiler/dart2js_native/native_method_rename1_frog_test.dart
@@ -4,7 +4,7 @@
 
 // Test the feature where the native string declares the native method's name.
 
-import 'native_testing.dart';
+import "package:expect/expect.dart";
 import 'dart:_js_helper' show Native, JSName;
 
 @Native("A")
@@ -34,13 +34,14 @@ A.prototype.barA = function(){return 200;};
 A.prototype.bazA = function(){return 300;};
 
 makeA = function(){return new A};
-
-self.nativeConstructor(A);
 """;
 
 testDynamic() {
-  var a = confuse(makeA());
-  var b = confuse(new B());
+  setup();
+
+  var things = [makeA(), new B()];
+  var a = things[0];
+  var b = things[1];
 
   Expect.equals(100, a.foo());
   Expect.equals(200, a.bar());
@@ -61,7 +62,6 @@ testTyped() {
 }
 
 main() {
-  nativeTesting();
   setup();
   testDynamic();
   testTyped();