notifications: Forward declared Balloon in notification_options_menu_model.h

chrome/browser/notifications/notification_options_menu_model.h

 // Copyright (c) 2011 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 CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OPTIONS_MENU_MODEL_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OPTIONS_MENU_MODEL_H_
 
-#include "chrome/browser/notifications/balloon.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
 #include "ui/base/models/simple_menu_model.h"
 
+class Balloon;
+
 // Model for the corner-selection submenu.
 class CornerSelectionMenuModel : public ui::SimpleMenuModel,
                                  public ui::SimpleMenuModel::Delegate {
  public:
   explicit CornerSelectionMenuModel(Balloon* balloon);
   virtual ~CornerSelectionMenuModel();
 
   // Overridden from ui::SimpleMenuModel::Delegate:
   virtual bool IsCommandIdChecked(int command_id) const OVERRIDE;
   virtual bool IsCommandIdEnabled(int command_id) const OVERRIDE;
@@ skipping 30 matching lines @@
 
  private:
   Balloon* balloon_; // Not owned.
 
   scoped_ptr<CornerSelectionMenuModel> corner_menu_model_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationOptionsMenuModel);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OPTIONS_MENU_MODEL_H_