Removed NOTIFICATION_BROWSER_CLOSING notification

chrome/browser/ui/tabs/pinned_tab_service.h

 // Copyright (c) 2012 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_TABS_PINNED_TAB_SERVICE_H_
 #define CHROME_BROWSER_UI_TABS_PINNED_TAB_SERVICE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "chrome/browser/ui/browser_list_observer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 // PinnedTabService is responsible for updating preferences with the set of
 // pinned tabs to restore at startup. PinnedTabService listens for the
 // appropriate set of notifications to know it should update preferences.
 class PinnedTabService : public content::NotificationObserver,
+                         public chrome::BrowserListObserver,
                          public KeyedService {
  public:
   explicit PinnedTabService(Profile* profile);
 
  private:
   // content::NotificationObserver.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
+  // chrome::BrowserListObserver:
+  void OnBrowserCloseStarted(Browser* browser) override;
+
   Profile* profile_;
 
   // True if we should save the pinned tabs when a browser window closes or the
   // user exits the application.
   bool save_pinned_tabs_;
 
   // True if there is at least one normal browser for our profile.
   bool has_normal_browser_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(PinnedTabService);
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_PINNED_TAB_SERVICE_H_