Support forEachClassMember on closure classes

pkg/compiler/lib/src/js_model/elements.dart

 // Copyright (c) 2017, 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_model.elements;
 
-import '../common/names.dart' show Identifiers;
+import '../common/names.dart' show Names;
 import '../elements/entities.dart';
 import '../elements/names.dart';
 import '../elements/types.dart';
 import '../kernel/elements.dart';
 import '../kernel/element_map_impl.dart';
 import 'closure.dart' show KernelClosureClass;
 
 /// Map from 'frontend' to 'backend' elements.
 ///
 /// Frontend elements are what we read in, these typically represents concepts
@@ skipping 495 matching lines @@
   JField(int memberIndex, JLibrary library, JClass enclosingClass, Name name,
       {bool isStatic, this.isAssignable, this.isConst})
       : super(memberIndex, library, enclosingClass, name, isStatic: isStatic);
 
   @override
   bool get isField => true;
 
   String get _kind => 'field';
 }
 
-class JClosureCallMethod extends JFunction {
+class JClosureCallMethod extends JMethod {
   JClosureCallMethod(int memberIndex, KernelClosureClass containingClass,
-      JFunction origClosureFunctionNode)
-      : super(
-            memberIndex,
-            containingClass.library,
-            containingClass,
-            new Name(Identifiers.call, containingClass.library),
-            origClosureFunctionNode.parameterStructure,
-            origClosureFunctionNode.asyncMarker);
+      ParameterStructure parameterStructure, AsyncMarker asyncMarker)
+      : super(memberIndex, containingClass.library, containingClass, Names.call,
+            parameterStructure, asyncMarker,
+            isStatic: false, isExternal: false, isAbstract: false);
 
   String get _kind => 'closure_call';
 }
 
 class JTypeVariable implements TypeVariableEntity, IndexedTypeVariable {
   final int typeVariableIndex;
   final Entity typeDeclaration;
   final String name;
   final int index;
 
   JTypeVariable(
       this.typeVariableIndex, this.typeDeclaration, this.name, this.index);
 
   String toString() =>
       '${jsElementPrefix}type_variable(${typeDeclaration.name}.$name)';
 }