Remove Element.users support.

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 'package:analyzer/src/generated/utilities_collection.dart';
-
 import 'ast.dart';
 import 'element.dart';
 import 'engine.dart';
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'source.dart';
 import 'utilities_dart.dart';
 
 /**
  * Instances of the class `ClassElementHandle` implement a handle to a `ClassElement`.
@@ skipping 345 matching lines @@
 
   @override
   AstNode get node => actualElement.node;
 
   @override
   Source get source => actualElement.source;
 
   @override
   CompilationUnit get unit => actualElement.unit;
 
-  /**
-   * Identifiers of the elements that use this elements.
-   */
-  @override
-  IntSet get users => new IntSet();
-
   @override
   bool operator ==(Object object) =>
       object is Element && object.location == _location;
 
   @override
   accept(ElementVisitor visitor) => actualElement.accept(visitor);
 
-  /**
-   * Remember the given [element] as a user of this element.
-   */
-  @override
-  void addUser(Element element) {
-  }
-
   @override
   String computeDocumentationComment() =>
       actualElement.computeDocumentationComment();
 
   @override
   Element getAncestor(Predicate<Element> predicate) =>
       actualElement.getAncestor(predicate);
 
   @override
   String getExtendedDisplayName(String shortName) =>
@@ skipping 676 matching lines @@
   DartType get type => actualElement.type;
 }
 /**
  * TODO(scheglov) invalid implementation
  */
 class WeakReference<T> {
   final T value;
   WeakReference(this.value);
   T get() => value;
 }