ProfileSyncService: Handle null SupervisedUserService

chrome/browser/supervised_user/supervised_user_service_factory.cc

 // Copyright 2014 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/supervised_user/supervised_user_service_factory.h"
 
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/supervised_user/supervised_user_service.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/features/features.h"
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
 #endif
 
 // static
 SupervisedUserService* SupervisedUserServiceFactory::GetForProfile(
     Profile* profile) {
   return static_cast<SupervisedUserService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
+SupervisedUserService* SupervisedUserServiceFactory::GetForProfileIfExists(
+    Profile* profile) {
+  return static_cast<SupervisedUserService*>(
+      GetInstance()->GetServiceForBrowserContext(profile, /*create=*/false));
+}
+
+// static
 SupervisedUserServiceFactory* SupervisedUserServiceFactory::GetInstance() {
   return base::Singleton<SupervisedUserServiceFactory>::get();
 }
 
 // static
 KeyedService* SupervisedUserServiceFactory::BuildInstanceFor(Profile* profile) {
   return new SupervisedUserService(profile);
 }
 
 SupervisedUserServiceFactory::SupervisedUserServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "SupervisedUserService",
         BrowserContextDependencyManager::GetInstance()) {
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   DependsOn(
       extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
 #endif
   DependsOn(ProfileOAuth2TokenServiceFactory::GetInstance());
-
-  // TODO(skym, crbug.com/705545): Fix this circular dependency.
   DependsOn(ProfileSyncServiceFactory::GetInstance());
 }
 
 SupervisedUserServiceFactory::~SupervisedUserServiceFactory() {}
 
 content::BrowserContext* SupervisedUserServiceFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 KeyedService* SupervisedUserServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return BuildInstanceFor(static_cast<Profile*>(profile));
 }