Restore KeyedServiceFactory diagnostics for context use-after-destroy.

apps/app_load_service.cc

 // 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.
 
 #include "apps/app_load_service.h"
 
 #include "apps/app_load_service_factory.h"
 #include "apps/app_restore_service.h"
 #include "apps/launcher.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 22 matching lines @@
 }
 
 AppLoadService::AppLoadService(Profile* profile)
     : profile_(profile) {
   registrar_.Add(this,
                  extensions::NOTIFICATION_EXTENSION_HOST_DID_STOP_FIRST_LOAD,
                  content::NotificationService::AllSources());
   extensions::ExtensionRegistry::Get(profile_)->AddObserver(this);
 }
 
-AppLoadService::~AppLoadService() {
+AppLoadService::~AppLoadService() = default;
+
+void AppLoadService::Shutdown() {
   extensions::ExtensionRegistry::Get(profile_)->RemoveObserver(this);
 }
 
 void AppLoadService::RestartApplication(const std::string& extension_id) {
   post_reload_actions_[extension_id].action_type = RESTART;
   ExtensionService* service = extensions::ExtensionSystem::Get(profile_)->
       extension_service();
   DCHECK(service);
   service->ReloadExtension(extension_id);
 }
@@ skipping 99 matching lines @@
             Extension::DISABLE_RELOAD) != 0;
   }
   return false;
 }
 
 bool AppLoadService::HasPostReloadAction(const std::string& extension_id) {
   return post_reload_actions_.find(extension_id) != post_reload_actions_.end();
 }
 
 }  // namespace apps