Remove addLast from List.

samples/swarm/swarm_ui_lib/observable/observable.dart

 // Copyright (c) 2011, 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 observable;
 
 import 'dart:collection';
 
 part 'ChangeEvent.dart';
 part 'EventBatch.dart';
@@ skipping 157 matching lines @@
     if (compare == null) compare = Comparable.compare;
     _internal.sort(compare);
     recordGlobalChange();
   }
 
   void add(T element) {
     recordListInsert(length, element);
     _internal.add(element);
   }
 
-  void addLast(T element) {
-    add(element);
-  }
-
   void addAll(Iterable<T> elements) {
     for (T element in elements) {
       add(element);
     }
   }
 
   int push(T element) {
     recordListInsert(length, element);
     _internal.add(element);
     return _internal.length;
@@ skipping 147 matching lines @@
     // Only fire on an actual change.
     if (!identical(newValue, _value)) {
       final oldValue = _value;
       _value = newValue;
       recordPropertyUpdate("value", newValue, oldValue);
     }
   }
 
   T _value;
 }