Restore KeyedServiceFactory diagnostics for context use-after-destroy.

chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.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 "chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 96 matching lines @@
   if (router) {
     router->RegisterObserver(
         this, api::signed_in_devices::OnDeviceInfoChange::kEventName);
   }
 
   // Register for unload event so we could clear all our listeners when
   // extensions have unloaded.
   extension_registry_observer_.Add(ExtensionRegistry::Get(profile_));
 }
 
-SignedInDevicesManager::~SignedInDevicesManager() {
+SignedInDevicesManager::~SignedInDevicesManager() = default;
+
+void SignedInDevicesManager::Shutdown() {
   if (profile_) {
     EventRouter* router = EventRouter::Get(profile_);
     if (router)
       router->UnregisterObserver(this);
   }
 }
 
 void SignedInDevicesManager::OnListenerAdded(
     const EventListenerInfo& details) {
   for (const std::unique_ptr<SignedInDevicesChangeObserver>& observer :
@@ skipping 26 matching lines @@
 }
 
 void SignedInDevicesManager::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const Extension* extension,
     UnloadedExtensionInfo::Reason reason) {
   RemoveChangeObserverForExtension(extension->id());
 }
 
 }  // namespace extensions