Revert "Remaining private libs"

sdk/lib/collection/linked_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";
+part of "collection.dart";
 
 /**
  * A specialized double-linked list of elements that extends [LinkedListEntry].
  *
  * This is not a generic data structure. It only accepts elements that extend
  * the [LinkedListEntry] class. See the [Queue] implementations for
  * generic collections that allow constant time adding and removing at the ends.
  *
  * This is not a [List] implementation. Despite its name, this class does not
  * implement the [List] interface. It does not allow constant time lookup by
@@ skipping 268 matching lines @@
   /**
    * Insert an element before this element in this element's linked list.
    *
    * This entry must be in a linked list when this method is called.
    * The [entry] must not be in a linked list.
    */
   void insertBefore(E entry) {
     _list._insertBefore(this as dynamic/*=E*/, entry, updateFirst: true);
   }
 }