Change IllegalArgumentException to ArgumentError.

lib/html/templates/html/impl/impl_DocumentFragment.darttemplate

 // Copyright (c) 2011, 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 FilteredElementList implements ElementList {
   final Node _node;
   final NodeList _childNodes;
 
   FilteredElementList(Node node): _childNodes = node.nodes, _node = node;
 
@@ skipping 20 matching lines @@
 
   void operator []=(int index, Element value) {
     this[index].replaceWith(value);
   }
 
   void set length(int newLength) {
     final len = this.length;
     if (newLength >= len) {
       return;
     } else if (newLength < 0) {
-      throw const IllegalArgumentException("Invalid list length");
+      throw const ArgumentError("Invalid list length");
     }
 
     removeRange(newLength - 1, len - newLength);
   }
 
   void add(Element value) {
     _childNodes.add(value);
   }
 
   void addAll(Collection<Element> collection) {
@@ skipping 131 matching lines @@
     switch (where.toLowerCase()) {
       case "beforebegin": return null;
       case "afterend": return null;
       case "afterbegin":
         this.insertBefore(node, this.nodes.first);
         return node;
       case "beforeend":
         this.nodes.add(node);
         return node;
       default:
-        throw new IllegalArgumentException("Invalid position ${where}");
+        throw new ArgumentError("Invalid position ${where}");
     }
   }
 
   Element insertAdjacentElement(String where, Element element)
     => this._insertAdjacentNode(where, element);
 
   void insertAdjacentText(String where, String text) {
     this._insertAdjacentNode(where, new Text(text));
   }
 
@@ skipping 148 matching lines @@
       "WebKit drop zone can't be set for document fragments.");
   }
 
   void set webkitRegionOverflow(String value) {
     throw new UnsupportedOperationException(
       "WebKit region overflow can't be set for document fragments.");
   }
 
 $!MEMBERS
 }