(TBR) Add missed override

pkg/analyzer/lib/src/generated/element.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 engine.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/src/generated/utilities_general.dart';
@@ skipping 10825 matching lines @@
    * Initialize a newly created element to represent a constructor, based on the
    * [baseElement], defined by the [definingType].
    */
   VariableMember(VariableElement baseElement, ParameterizedType definingType)
       : super(baseElement, definingType);
 
   @override
   VariableElement get baseElement => super.baseElement as VariableElement;
 
   @override
+  DartObject get constantValue => baseElement.constantValue;
+
+  @override
   bool get hasImplicitType => baseElement.hasImplicitType;
 
   @override
   FunctionElement get initializer {
     //
     // Elements within this element should have type parameters substituted,
     // just like this element.
     //
     throw new UnsupportedOperationException();
     //    return getBaseElement().getInitializer();
@@ skipping 99 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }