[Sync] Fix namespaces for the browser_sync component.

chrome/browser/sync/profile_sync_service_factory.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/sync/profile_sync_service_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
@@ skipping 34 matching lines @@
 
 #if defined(ENABLE_EXTENSIONS)
 #include "extensions/browser/extension_system_provider.h"
 #include "extensions/browser/extensions_browser_client.h"
 #endif
 
 #if !defined(OS_ANDROID)
 #include "chrome/browser/ui/global_error/global_error_service_factory.h"
 #endif
 
+using browser_sync::ProfileSyncService;
+
 namespace {
 
 void UpdateNetworkTimeOnUIThread(base::Time network_time,
                                  base::TimeDelta resolution,
                                  base::TimeDelta latency,
                                  base::TimeTicks post_time) {
   g_browser_process->network_time_tracker()->UpdateNetworkTime(
       network_time, resolution, latency, post_time);
 }
 
@@ skipping 10 matching lines @@
 
 // static
 ProfileSyncServiceFactory* ProfileSyncServiceFactory::GetInstance() {
   return base::Singleton<ProfileSyncServiceFactory>::get();
 }
 
 // static
 ProfileSyncService* ProfileSyncServiceFactory::GetForProfile(
     Profile* profile) {
   if (!ProfileSyncService::IsSyncAllowedByFlag())
-    return NULL;
+    return nullptr;
 
   return static_cast<ProfileSyncService*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 sync_driver::SyncService*
 ProfileSyncServiceFactory::GetSyncServiceForBrowserContext(
     content::BrowserContext* context) {
   return GetForProfile(Profile::FromBrowserContext(context));
@@ skipping 95 matching lines @@
 
   auto pss = base::MakeUnique<ProfileSyncService>(std::move(init_params));
 
   // Will also initialize the sync client.
   pss->Initialize();
   return pss.release();
 }
 
 // static
 bool ProfileSyncServiceFactory::HasProfileSyncService(Profile* profile) {
-  return GetInstance()->GetServiceForBrowserContext(profile, false) != NULL;
+  return GetInstance()->GetServiceForBrowserContext(profile, false) != nullptr;
 }
 
 // static
 void ProfileSyncServiceFactory::SetSyncClientFactoryForTest(
     SyncClientFactory* client_factory) {
   client_factory_ = client_factory;
 }
 
 // static
 ProfileSyncServiceFactory::SyncClientFactory*
     ProfileSyncServiceFactory::client_factory_ = nullptr;