Removed NOTIFICATION_BROWSER_CLOSING notification

chrome/browser/ui/ash/launcher/browser_shortcut_launcher_item_controller.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 CHROME_BROWSER_UI_ASH_LAUNCHER_BROWSER_SHORTCUT_LAUNCHER_ITEM_CONTROLLER_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_BROWSER_SHORTCUT_LAUNCHER_ITEM_CONTROLLER_H_
 
 #include "ash/public/cpp/shelf_item_delegate.h"
 #include "base/macros.h"
+#include "base/scoped_observer.h"
 #include "chrome/browser/ui/browser_list.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
+#include "chrome/browser/ui/browser_list_observer.h"
 
 namespace ash {
 class ShelfModel;
 }
 
 namespace content {
 class WebContents;
 }
 
 // Shelf item delegate for a browser shortcut; only one such item should exist.
 // This item shows an application menu that lists open browser windows or tabs.
 class BrowserShortcutLauncherItemController
     : public ash::ShelfItemDelegate,
-      public content::NotificationObserver {
+      public chrome::BrowserListObserver {
  public:
   explicit BrowserShortcutLauncherItemController(ash::ShelfModel* shelf_model);
 
   ~BrowserShortcutLauncherItemController() override;
 
   // Updates the activation state of the Broswer item.
   void UpdateBrowserItemState();
 
   // Sets the shelf id for the browser window if the browser is represented.
   void SetShelfIDForBrowserWindowContents(Browser* browser,
@@ skipping 17 matching lines @@
   // SHELF_ACTION_WINDOW_ACTIVATED, or SHELF_ACTION_NEW_WINDOW_CREATED.
   ash::ShelfAction ActivateOrAdvanceToNextBrowser();
 
   // Returns true when the given |browser| is listed in the browser application
   // list.
   bool IsBrowserRepresentedInBrowserList(Browser* browser);
 
   // Get a list of active browsers.
   BrowserList::BrowserVector GetListOfActiveBrowsers();
 
-  // content::NotificationObserver:
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
+  // chrome::BrowserListObserver:
+  void OnBrowserClosing(Browser* browser) override;
 
   ash::ShelfModel* shelf_model_;
 
   // The cached list of open browser windows shown in an application menu.
   BrowserList::BrowserVector browser_menu_items_;
 
-  // Registers for notifications of closing browser windows.
-  content::NotificationRegistrar registrar_;
+  // Observer for browser windows closing events.
+  ScopedObserver<BrowserList, BrowserListObserver> browser_list_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserShortcutLauncherItemController);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_BROWSER_SHORTCUT_LAUNCHER_ITEM_CONTROLLER_H_