Remove addLast from List.

runtime/lib/growable_array.dart

 // Copyright (c) 2012, 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.
 
 class _GrowableObjectArray<T> implements List<T> {
   factory _GrowableObjectArray._uninstantiable() {
     throw new UnsupportedError(
         "GrowableObjectArray can only be allocated by the VM");
   }
 
@@ skipping 160 matching lines @@
   // doubling its size.
   void add(T value) {
     var len = length;
     if (len == _capacity) {
       _grow(len * 2);
     }
     _setLength(len + 1);
     this[len] = value;
   }
 
-  void addLast(T element) {
-    add(element);
-  }
-
   void addAll(Iterable<T> iterable) {
     for (T elem in iterable) {
       add(elem);
     }
   }
 
   T removeLast() {
     var len = length - 1;
     var elem = this[len];
     this[len] = null;
@@ skipping 152 matching lines @@
   }
 
   Set<T> toSet() {
     return new Set<T>.from(this);
   }
 
   Map<int, T> asMap() {
     return IterableMixinWorkaround.asMapList(this);
   }
 }