Moves over remaining .dart code references to 'factory' in interface declartions to 'default'

samples/actors/core/actors.dart

 
 class _ActorManagerImpl extends Actor implements ActorManager {
 
   /**
    * This determines the next worker to be used for creating an actor.
    */
   int _nextWorkerIndex;
   
   /**
    * Total number of isolates.
@@ skipping 133 matching lines @@
       if (allowCreation) anActor._manager = _manager;
       else anActor._manager = null;
       anActor._allowUIAccess = allowUIAccess;
       if (allowUIAccess) anActor._windowProxy = _windowProxy;
       else anActor._windowProxy = new _NullWindowProxy();
       anActor.me.send(msg.messageName, msg.params, msg.replyTo);
     };
   }
 }
 
-interface ActorManager factory _ActorManagerImpl {
+interface ActorManager default _ActorManagerImpl {
 
   /**
    * Creates an Actor Manager with the specified number of isolates as 
    * background processes. 
    */
   ActorManager(int numOfIsolates);
 
   /**
    * Creates an actor using the specified factory and sends a message to it.
    */
@@ skipping 49 matching lines @@
       _to.send(_msgName, params, replyTo);
   }
   
   /** 
    * Returns the name of the message which is responsible to handle this 
    * Reply. 
    */
   String get message() => _msgName;
 }