Make getKeys, getValues getters (keys, values).

samples/ui_lib/observable/EventBatch.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.
 
 /**
  * Accumulates change events from several observable objects.
  *
  * wrap() is public and used by client code.  The other methods are used by
  * AbstractObservable, which works with this class to implement batching.
  */
@@ skipping 79 matching lines @@
       summary = new EventSummary(obj);
       summaries[uid] = summary;
     }
     return summary;
   }
 
   /** Fires all events at once. */
   void _notify() {
     assert(!sealed);
     sealed = true;
-    for (final summary in summaries.getValues()) {
+    for (final summary in summaries.values) {
       summary.notify();
     }
   }
 }