Use MemberElement instead of Element in function sets and selectors.

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.dart

 // Copyright (c) 2014, 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 dart2js.js_emitter.full_emitter;
 
 import 'dart:collection' show HashMap;
 import 'dart:convert';
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 import 'package:js_runtime/shared/embedded_names.dart'
     show JsBuiltin, JsGetName;
 
 import '../../common.dart';
 import '../../common/names.dart' show Names;
 import '../../compiler.dart' show Compiler;
 import '../../constants/values.dart';
 import '../../core_types.dart' show CommonElements;
 import '../../elements/resolution_types.dart' show DartType;
 import '../../deferred_load.dart' show OutputUnit;
 import '../../elements/elements.dart'
     show
         ClassElement,
         Element,
         Elements,
         FieldElement,
         FunctionElement,
         FunctionSignature,
         LibraryElement,
+        MemberElement,
         MetadataAnnotation,
         MethodElement,
         Name,
         TypedefElement,
         VariableElement;
 import '../../hash/sha1.dart' show Hasher;
 import '../../io/code_output.dart';
 import '../../io/line_column_provider.dart'
     show LineColumnCollector, LineColumnProvider;
 import '../../io/source_map_builder.dart' show SourceMapBuilder;
@@ skipping 2139 matching lines @@
     if (cachedElements.isEmpty) return;
     for (Element element in backend.codegenEnqueuer.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
       }
     }
   }
 }