Find native classes with mixins in NativeClassFinder

pkg/compiler/lib/src/js_backend/backend.dart

 // Copyright (c) 2012, 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.
 
 library js_backend.backend;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show ForeignResolver, NativeRegistry, ImpactTransformer;
 import '../common/codegen.dart' show CodegenImpact, CodegenWorkItem;
@@ skipping 976 matching lines @@
       function = function.withSourceInformation(
           sourceInformationStrategy.buildSourceMappedMarker());
     }
     generatedCode[element] = function;
     WorldImpact worldImpact = _codegenImpactTransformer
         .transformCodegenImpact(work.registry.worldImpact);
     compiler.dumpInfoTask.registerImpact(element, worldImpact);
     return worldImpact;
   }
 
-  // TODO(johnniwinther): Remove this. It is now only used for testing.
-  @deprecated
-  native.NativeEnqueuer get nativeResolutionEnqueuer =>
+  native.NativeResolutionEnqueuer get nativeResolutionEnqueuerForTesting =>
       _nativeResolutionEnqueuer;
 
   native.NativeEnqueuer get nativeCodegenEnqueuer => _nativeCodegenEnqueuer;
 
   ClassElement defaultSuperclass(ClassElement element) {
     if (nativeBasicData.isJsInteropClass(element)) {
       return commonElements.jsJavaScriptObjectClass;
     }
     // Native classes inherit from Interceptor.
     return nativeBasicData.isNativeClass(element)
@@ skipping 442 matching lines @@
 
   bool canUseAliasedSuperMember(MemberEntity member, Selector selector) {
     return !selector.isGetter;
   }
 
   /// Returns `true` if [member] is called from a subclass via `super`.
   bool isAliasedSuperMember(MemberEntity member) {
     return _aliasedSuperMembers.contains(member);
   }
 }