Revert "Add "last" setter to List."

runtime/lib/typed_data.dart

 // Copyright (c) 2013, 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.
 
 // patch classes for Int8List ..... Float64List and ByteData implementations.
 
 import "dart:_internal";
 import 'dart:math' show Random;
 
 patch class Int8List {
@@ skipping 391 matching lines @@
 
   bool get isNotEmpty => !isEmpty;
 
   // Method(s) implementing the List interface.
 
   set length(newLength) {
     throw new UnsupportedError(
         "Cannot resize a fixed-length list");
   }
 
-  void set last(value) {
-    if (isEmpty) throw IterableElementError.noElement();
-    this[length - 1] = value;
-  }
-
   void add(value) {
     throw new UnsupportedError(
         "Cannot add to a fixed-length list");
   }
 
   void addAll(Iterable value) {
     throw new UnsupportedError(
         "Cannot add to a fixed-length list");
   }
 
@@ skipping 3208 matching lines @@
     return value;
   }
   return object;
 }
 
 
 void _throwRangeError(int index, int length) {
   String message = "$index must be in the range [0..$length)";
   throw new RangeError(message);
 }