Move Iterable implementation to collection.

pkg/serialization/lib/src/basic_rule.dart

 // Copyright (c) 2012, 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 serialization;
 
 // TODO(alanknight): Figure out how to reasonably separate out the things
 // that require reflection without making the API more awkward. Or if that is
 // in fact necessary. Maybe the tree-shaking will just remove it if unused.
 
@@ skipping 401 matching lines @@
    * use the value for that.
    */
   get name => value;
 }
 
 /**
  * The organization of fields in an object can be reasonably complex, so they
  * are kept in a separate object, which also has the ability to compute the
  * default fields to use reflectively.
  */
-class _FieldList extends Iterable {
+class _FieldList extends IterableBase {
   /**
    * All of our fields, indexed by name. Note that the names are not
    * necessarily strings.
    */
   Map<dynamic, _Field> allFields = new Map<dynamic, _Field>();
 
   /**
    * The fields which are used in the constructor. The fields themselves also
    * know if they are constructor fields or not, but we need to keep this
    * information here because the order matters.
@@ skipping 197 matching lines @@
   _MapWrapper(this.fieldList) : _map = new Map();
   _MapWrapper.fromMap(this._map, this.fieldList);
 
   operator [](key) => _map[fieldList[key].name];
 
   operator []=(key, value) { _map[fieldList[key].name] = value; }
   get length => _map.length;
 
   asMap() => _map;
 }