Convert //chrome/browser/sync_file_system from scoped_ptr to std::unique_ptr

chrome/browser/sync_file_system/remote_file_sync_service.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/sync_file_system/remote_file_sync_service.h"
 
 #include "chrome/browser/sync_file_system/drive_backend/sync_engine.h"
 
 namespace sync_file_system {
 
-scoped_ptr<RemoteFileSyncService>
-RemoteFileSyncService::CreateForBrowserContext(
-    content::BrowserContext* context,
-    TaskLogger* task_logger) {
+std::unique_ptr<RemoteFileSyncService>
+RemoteFileSyncService::CreateForBrowserContext(content::BrowserContext* context,
+                                               TaskLogger* task_logger) {
   return drive_backend::SyncEngine::CreateForBrowserContext(context,
                                                             task_logger);
 }
 
 void RemoteFileSyncService::AppendDependsOnFactories(
     std::set<BrowserContextKeyedServiceFactory*>* factories) {
   drive_backend::SyncEngine::AppendDependsOnFactories(factories);
 }
 
 }  // namespace sync_file_system