[SyncFS] SyncWorker cache refresh token status

chrome/browser/sync_file_system/drive_backend/drive_service_wrapper.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/sync_file_system/drive_backend/drive_service_wrapper.h"
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/drive/drive_service_interface.h"
@@ skipping 68 matching lines @@
     const google_apis::GetResourceEntryCallback& callback) {
   drive_service_->GetResourceEntry(resource_id, callback);
 }
 
 void DriveServiceWrapper::GetFileListInDirectory(
     const std::string& directory_resource_id,
     const google_apis::FileListCallback& callback) {
   drive_service_->GetFileListInDirectory(directory_resource_id, callback);
 }
 
-bool DriveServiceWrapper::HasRefreshToken() const {
-  return drive_service_->HasRefreshToken();
-}
-
 void DriveServiceWrapper::RemoveResourceFromDirectory(
     const std::string& parent_resource_id,
     const std::string& resource_id,
     const google_apis::EntryActionCallback& callback) {
   drive_service_->RemoveResourceFromDirectory(
       parent_resource_id, resource_id, callback);
 }
 
 void DriveServiceWrapper::SearchByTitle(
     const std::string& title,
     const std::string& directory_resource_id,
     const google_apis::FileListCallback& callback) {
   drive_service_->SearchByTitle(
       title, directory_resource_id, callback);
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system