Fix stability and data racing issues, coalesce more updates for JumpList

chrome/browser/win/jumplist_factory.cc

 // Copyright 2016 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/win/jumplist_factory.h"
 
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/history/top_sites_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 // static
-scoped_refptr<JumpList> JumpListFactory::GetForProfile(Profile* profile) {
+JumpList* JumpListFactory::GetForProfile(Profile* profile) {
   return static_cast<JumpList*>(
-      GetInstance()->GetServiceForBrowserContext(profile, true).get());
+      GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 JumpListFactory* JumpListFactory::GetInstance() {
   return base::Singleton<JumpListFactory>::get();
 }
 
 JumpListFactory::JumpListFactory()
-    : RefcountedBrowserContextKeyedServiceFactory(
+    : BrowserContextKeyedServiceFactory(
           "JumpList",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(TabRestoreServiceFactory::GetInstance());
   DependsOn(TopSitesFactory::GetInstance());
   DependsOn(FaviconServiceFactory::GetInstance());
 }
 
 JumpListFactory::~JumpListFactory() = default;
 
-scoped_refptr<RefcountedKeyedService> JumpListFactory::BuildServiceInstanceFor(
+KeyedService* JumpListFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new JumpList(Profile::FromBrowserContext(context));
 }