Remove use of Element in ResolutionEnqueuerListener.

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

 // Copyright (c) 2013, 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.
 
 import '../common/backend_api.dart';
 import '../common/resolution.dart';
 import '../common_elements.dart';
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
+import '../elements/elements.dart';
+import '../elements/entities.dart';
 import '../elements/resolution_types.dart';
-import '../elements/elements.dart';
 import '../universe/call_structure.dart';
 import '../universe/use.dart' show ConstantUse, StaticUse;
 import '../universe/world_impact.dart'
     show WorldImpact, StagedWorldImpactBuilder;
 import 'backend_usage.dart' show BackendUsageBuilder;
 import 'backend_helpers.dart';
 import 'native_data.dart';
 
 /**
  * Support for Custom Elements.
@@ skipping 45 matching lines @@
     classElement.ensureResolved(_resolution);
     if (!_nativeData.isNativeOrExtendsNative(classElement)) return;
     if (classElement.isMixinApplication) return;
     if (classElement.isAbstract) return;
     // JsInterop classes are opaque interfaces without a concrete
     // implementation.
     if (_nativeData.isJsInteropClass(classElement)) return;
     join.instantiatedClasses.add(classElement);
   }
 
-  void registerStaticUse(Element element) {
+  void registerStaticUse(MemberEntity element) {
     assert(element != null);
     if (element == _helpers.findIndexForNativeSubclassType) {
       join.demanded = true;
     }
   }
 
   /// Computes the [WorldImpact] of the classes registered since last flush.
   WorldImpact flush() => join.flush();
 }
 
@@ skipping 163 matching lines @@
           result.add(member);
         }
       }
     }
 
     classElement.forEachMember(selectGenerativeConstructors,
         includeBackendMembers: false, includeSuperAndInjectedMembers: false);
     return result;
   }
 }