Fix an old TODO.

sdk/lib/_collection_dev/iterable.dart

 // 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.
 
 part of dart._collection.dev;
 
 /**
  * Marker interface for [Iterable] subclasses that have an efficient
  * [length] implementation.
  */
@@ skipping 998 matching lines @@
     while (length > 1) {
       int pos = random.nextInt(length);
       length -= 1;
       var tmp = list[length];
       list[length] = list[pos];
       list[pos] = tmp;
     }
   }
 
   static int indexOfList(List list, var element, int start) {
-    return Arrays.indexOf(list, element, start, list.length);
+    return Lists.indexOf(list, element, start, list.length);
   }
 
   static int lastIndexOfList(List list, var element, int start) {
     if (start == null) start = list.length - 1;
-    return Arrays.lastIndexOf(list, element, start);
+    return Lists.lastIndexOf(list, element, start);
   }
 
   static void _rangeCheck(List list, int start, int end) {
     if (start < 0 || start > list.length) {
       throw new RangeError.range(start, 0, list.length);
     }
     if (end < start || end > list.length) {
       throw new RangeError.range(end, start, list.length);
     }
   }
@@ skipping 18 matching lines @@
     if (from is List) {
       otherList = from;
       otherStart = skipCount;
     } else {
       otherList = from.skip(skipCount).toList(growable: false);
       otherStart = 0;
     }
     if (otherStart + length > otherList.length) {
       throw new StateError("Not enough elements");
     }
-    Arrays.copy(otherList, otherStart, list, start, length);
+    Lists.copy(otherList, otherStart, list, start, length);
   }
 
   static void replaceRangeList(List list, int start, int end,
                                Iterable iterable) {
     _rangeCheck(list, start, end);
     if (iterable is! EfficientLength) {
       iterable = iterable.toList();
     }
     int removeLength = end - start;
     int insertLength = iterable.length;
@@ skipping 84 matching lines @@
 
   static Set setDifference(Set set, Set other, Set result) {
     for (var element in set) {
       if (!other.contains(element)) {
         result.add(element);
       }
     }
     return result;
   }
 }