Fix a batch of DDC SDK compile errors.

sdk/lib/collection/queue.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;
 
 /**
  * A [Queue] is a collection that can be manipulated at both ends. One
  * can iterate over the elements of a queue through [forEach] or with
  * an [Iterator].
@@ skipping 76 matching lines @@
    * The `test` function must not throw or modify the queue.
    */
   void retainWhere(bool test(E element));
 
   /**
    * Removes all elements in the queue. The size of the queue becomes zero.
    */
   void clear();
 }
 
-class _DoubleLink<Link extends _DoubleLink> {
+class _DoubleLink<Link extends _DoubleLink<Link>> {
   Link _previousLink;
   Link _nextLink;
 
   void _link(Link previous, Link next) {
     _nextLink = next;
     _previousLink = previous;
     if (previous != null) previous._nextLink = this;
     if (next != null) next._previousLink = this;
   }
 
@@ skipping 764 matching lines @@
     _queue._checkModification(_modificationCount);
     if (_position == _end) {
       _current = null;
       return false;
     }
     _current = _queue._table[_position];
     _position = (_position + 1) & (_queue._table.length - 1);
     return true;
   }
 }