Revert "Hide collection-dev library."

sdk/lib/collection_dev/list.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._collection.dev;
+part of dart.collection.dev;
 
 /**
  * Class implementing the read-operations on [List].
  *
  * Implements all read-only operations, except [:operator[]:] and [:length:],
  * in terms of those two operations.
  */
 abstract class ListBase<E> extends Collection<E> implements List<E> {
   Iterator<E> get iterator => new ListIterator(this);
 
@@ skipping 524 matching lines @@
       throw new ConcurrentModificationError(_list);
     }
     if (_index <= _start) return false;
     _index -= 1;
     _current = _list[_index];
     return true;
   }
 
   E get current => _current;
 }