Remove Element.users support.

pkg/analyzer/lib/src/generated/utilities_collection.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.utilities.collection;
 
 import "dart:math" as math;
@@ skipping 451 matching lines @@
         component.add(w);
         _nodeMap[w].component = component;
       } while (!identical(w, v));
       _allComponents.add(component);
     }
     return vInfo;
   }
 }
 
 /**
- * An efficient [int] set.
- * Currently not really efficient.
- */
-class IntSet {
-  HashSet<int> _set = new HashSet<int>();
-
-  bool get isEmpty {
-    return _set.isEmpty;
-  }
-
-  void add(int value) {
-    _set.add(value);
-  }
-
-  int remove() {
-    int value = _set.first;
-    _set.remove(value);
-    return value;
-  }
-
-  @override
-  String toString() {
-    return _set.toString();
-  }
-}
-
-/**
  * The class `ListUtilities` defines utility methods useful for working with [List
  ].
  */
 class ListUtilities {
   /**
    * Add all of the elements in the given array to the given list.
    *
    * @param list the list to which the elements are to be added
    * @param elements the elements to be added to the list
    */
@@ skipping 252 matching lines @@
   /**
    * Map the key to the value.
    *
    * @param key the token being mapped to the value
    * @param value the token to which the key will be mapped
    */
   void put(Token key, Token value) {
     _map[key] = value;
   }
 }