Move Chrome terminating notification out of //apps

apps/app_lifetime_monitor.h

 // Copyright 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 APPS_APP_LIFETIME_MONITOR_H_
 #define APPS_APP_LIFETIME_MONITOR_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 19 matching lines @@
     virtual void OnAppStart(Profile* profile, const std::string& app_id) {}
     // Called when the app becomes active to the user, i.e. the first window
     // becomes visible.
     virtual void OnAppActivated(Profile* profile, const std::string& app_id) {}
     // Called when the app becomes inactive to the user, i.e. the last window is
     // hidden or closed.
     virtual void OnAppDeactivated(Profile* profile, const std::string& app_id) {
     }
     // Called when the app stops running.
     virtual void OnAppStop(Profile* profile, const std::string& app_id) {}
-    // Called when chrome is about to terminate. This gives observers a chance
-    // to do something before the apps shut down. This is a system-wide event
-    // so there is no associated profile and app id.
-    virtual void OnChromeTerminating() {}
 
    protected:
     virtual ~Observer() {}
   };
 
   explicit AppLifetimeMonitor(Profile* profile);
   ~AppLifetimeMonitor() override;
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
@@ skipping 12 matching lines @@
 
   // KeyedService overrides:
   void Shutdown() override;
 
   bool HasOtherVisibleAppWindows(extensions::AppWindow* app_window) const;
 
   void NotifyAppStart(const std::string& app_id);
   void NotifyAppActivated(const std::string& app_id);
   void NotifyAppDeactivated(const std::string& app_id);
   void NotifyAppStop(const std::string& app_id);
-  void NotifyChromeTerminating();
 
   content::NotificationRegistrar registrar_;
   Profile* profile_;
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLifetimeMonitor);
 };
 
 }  // namespace apps
 
 #endif  // APPS_APP_LIFETIME_MONITOR_H_