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

client/samples/dartcombat/player.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.
 
 /** A local player (API known to the main isolate when creating players). */
-interface Player factory PlayerImpl {
+interface Player default PlayerImpl {
 
   Player();
 
   final Future<SendPort> portToPlayer;
 
   void setup(Window window, int player);
 
   void set enemy(SendPort portToEnemy);
 
   void set _portForTest(SendPort testPort);
 }
 
 /** A remote enemy (API visible to a player to communicate with the enemy). */
-interface Enemy factory EnemyImpl {
+interface Enemy default EnemyImpl {
   Enemy(SendPort port);
 
   /** tell the enemy that we are ready, receive confirmation asynchronously. */
   Future<int> ready();
 
   /** shoot asynchronously. */
   Future<int> shoot(int x, int y);
 }
 
 
@@ skipping 75 matching lines @@
 
   /** message indicating that the enemy is ready to play. */
   static final ENEMY_IS_READY = 3;
 
   /** message describing a shoot action. */
   static final SHOOT = 4;
 
   /** message to set up a test port, used to make tests non-flaky. */
   static final SET_PORT_FOR_TEST = 5;
 }