Implement _ChildNodeListLazy.removeRange as throwing UnsupportedError

tools/dom/templates/html/impl/impl_Node.darttemplate

 // 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 $LIBRARYNAME;
 
 /**
  * Lazy implementation of the child nodes of an element that does not request
  * the actual child nodes of an element until strictly necessary greatly
  * improving performance for the typical cases where it is not required.
@@ skipping 159 matching lines @@
 
   // FIXME: implement these.
   void setRange(int start, int end, Iterable<Node> iterable,
                 [int skipCount = 0]) {
     throw new UnsupportedError("Cannot setRange on Node list");
   }
 
   void fillRange(int start, int end, [Node fill]) {
     throw new UnsupportedError("Cannot fillRange on Node list");
   }
+
+  void removeRange(int start, int end) {
+    throw new UnsupportedError("Cannot removeRange on Node list");
+  }
   // -- end List<Node> mixins.
 
   // TODO(jacobr): benchmark whether this is more efficient or whether caching
   // a local copy of childNodes is more efficient.
   int get length => _this.childNodes.length;
 
   set length(int value) {
     throw new UnsupportedError(
         "Cannot set length on immutable List.");
   }
@@ skipping 119 matching lines @@
    */
   @DomName('Node.childNodes')
   @DocsEditable()
   @Returns('NodeList')
   @Creates('NodeList')
   final List<Node> childNodes;
 
 $endif
 $!MEMBERS
 }