Remove insertRange.

tools/dom/src/WrappedList.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.
 
 part of dart.dom.html;
 
 /**
  * A list which just wraps another list, for either intercepting list calls or
  * retyping the list (for example, from List<A> to List<B> where B extends A).
  */
@@ skipping 98 matching lines @@
   E removeLast() => _list.removeLast();
 
   List<E> sublist(int start, [int end]) => _list.sublist(start, end);
 
   Iterable<E> getRange(int start, int end) => _list.getRange(start, end);
 
   void setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]) {
     _list.setRange(start, end, iterable, skipCount);
   }
 
-  void removeRange(int start, int length) { _list.removeRange(start, length); }
-
-  void insertRange(int start, int length, [E fill]) {
-    _list.insertRange(start, length, fill);
-  }
+  void removeRange(int start, int end) { _list.removeRange(start, end); }
 
   Map<int, E> asMap() => _list.asMap();
 
   String toString() {
     StringBuffer buffer = new StringBuffer('[');
     buffer.writeAll(this, ', ');
     buffer.write(']');
     return buffer.toString();
   }
 }
 
 /**
  * Iterator wrapper for _WrappedList.
  */
 class _WrappedIterator<E> implements Iterator<E> {
   Iterator _iterator;
 
   _WrappedIterator(this._iterator);
 
   bool moveNext() {
     return _iterator.moveNext();
   }
 
   E get current => _iterator.current;
 }