Implement 'node' for ClassElement and FieldElement for enums.

pkg/analyzer/lib/src/generated/element_handle.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.element_handle;
 
 import 'ast.dart';
@@ skipping 63 matching lines @@
   @override
   ElementKind get kind => ElementKind.CLASS;
 
   @override
   List<MethodElement> get methods => actualElement.methods;
 
   @override
   List<InterfaceType> get mixins => actualElement.mixins;
 
   @override
-  ClassDeclaration get node => actualElement.node;
-
-  @override
   InterfaceType get supertype => actualElement.supertype;
 
   @override
   InterfaceType get type => actualElement.type;
 
   @override
   List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
 
   @override
   ConstructorElement get unnamedConstructor => actualElement.unnamedConstructor;
@@ skipping 977 matching lines @@
   DartType get type => actualElement.type;
 }
 /**
  * TODO(scheglov) invalid implementation
  */
 class WeakReference<T> {
   final T value;
   WeakReference(this.value);
   T get() => value;
 }