[nacltoons] Rename core classes in accordance with doc.

nacltoons/src/ui_layer.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-#ifndef GAMEPLAY_SCENE_H_
-#define GAMEPLAY_SCENE_H_
+#ifndef UI_LAYER_H_
+#define UI_LAYER_H_
 
 #include "cocos2d.h"
 
 USING_NS_CC;
 
 /**
- * Main gameplay scene containing the physics layer
- * that the user can interact with and a UI layer over
- * the top for menus.
- */
-class GameplayScene : public CCScene {
- public:
-  GameplayScene(int level_number) : level_number_(level_number) {}
-  ~GameplayScene() {}
-  static GameplayScene* create(int level_number);
-  virtual bool init();
-  void Restart();
-  void GameOver(bool success);
- private:
-  int level_number_;
-};
-
-/**
  * UI layer for displaying menu and information overlays on
  * top of the running game.
  */
 class UILayer : public CCLayer {
  public:
   UILayer() {}
   ~UILayer() {}
   // add static create() method which encapsulates new + init
   CREATE_FUNC(UILayer);
   virtual bool init();
 
  private:
   // menu callbacks
   void ToggleDebug(CCObject* sender);
   void Restart(CCObject* sender);
   void Exit(CCObject* sender);
 };
 
-#endif  // GAMEPLAY_SCENE_H_
+#endif  // UI_LAYER_H_