Find native classes with mixins in NativeClassFinder

tests/compiler/dart2js/kernel/closed_world_test.dart

Index: tests/compiler/dart2js/kernel/closed_world_test.dart
diff --git a/tests/compiler/dart2js/kernel/closed_world_test.dart b/tests/compiler/dart2js/kernel/closed_world_test.dart
index f07e48fc8c779d34015ab8b1bd60624c1814f53c..04d1381941a5cdc55e837f136dd751fed75e82f9 100644
--- a/tests/compiler/dart2js/kernel/closed_world_test.dart
+++ b/tests/compiler/dart2js/kernel/closed_world_test.dart
@@ -155,7 +155,7 @@ List createResolutionEnqueuerListener(Compiler compiler) {
       backend.mirrorsResolutionAnalysis,
       new TypeVariableResolutionAnalysis(
           compiler.elementEnvironment, backend.impacts, backendUsageBuilder),
-      backend.nativeResolutionEnqueuer,
+      backend.nativeResolutionEnqueuerForTesting,
       compiler.deferredLoadTask,
       backend.kernelTask);
   return [listener, backendUsageBuilder];