Restore KeyedServiceFactory diagnostics for context use-after-destroy.

chrome/browser/extensions/api/input_ime/input_ime_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/input_ime/input_ime_api.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/lazy_instance.h"
@@ skipping 398 matching lines @@
 }
 
 void InputImeAPI::Observe(int type,
                           const content::NotificationSource& source,
                           const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_PROFILE_DESTROYED, type);
   extensions::InputImeEventRouterFactory::GetInstance()->RemoveProfile(
       content::Source<Profile>(source).ptr());
 }
 
-InputImeAPI::~InputImeAPI() {
+InputImeAPI::~InputImeAPI() = default;
+
+void InputImeAPI::Shutdown() {
   EventRouter::Get(browser_context_)->UnregisterObserver(this);
   registrar_.RemoveAll();
 }
 
 static base::LazyInstance<
     BrowserContextKeyedAPIFactory<InputImeAPI>>::DestructorAtExit g_factory =
     LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<InputImeAPI>* InputImeAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 InputImeEventRouter* GetInputImeEventRouter(Profile* profile) {
   if (!profile)
     return nullptr;
   if (profile->HasOffTheRecordProfile())
     profile = profile->GetOffTheRecordProfile();
   return extensions::InputImeEventRouterFactory::GetInstance()->GetRouter(
       profile);
 }
 
 }  // namespace extensions