Remove insertRange.

sdk/lib/core/list.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.
 
 part of dart.core;
 
 /**
  * A [List] is an indexable collection with a length.
  *
  * A `List` implementation can choose not to support all methods
@@ skipping 268 matching lines @@
 
   /**
    * Removes the elements in the range [start]..[end] (excluding).
    *
    * It is an error if [start]..[end] is not a valid range pointing into the
    * `this`.
    */
   void removeRange(int start, int end);
 
   /**
-   * Inserts a new range into the list, starting from [start] to
-   * [:start + length - 1:]. The entries are filled with [fill].
-   * Throws an [UnsupportedError] if the list is
-   * not extendable.
-   * If [length] is 0, this method does not do anything.
-   * If [start] is the length of the list, this method inserts the
-   * range at the end of the list.
-   * Throws an [ArgumentError] if [length] is negative.
-   * Throws an [RangeError] if [start] is negative or if
-   * [start] is greater than the length of the list.
-   */
-  void insertRange(int start, int length, [E fill]);
-
-  /**
    * Returns an unmodifiable [Map] view of `this`.
    *
    * It has the indices of this list as keys, and the corresponding elements
    * as values.
    */
   Map<int, E> asMap();
 }