[Sync] Remove backend unrecoverable error handler

sync/internal_api/sync_backup_manager.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 "sync/internal_api/sync_backup_manager.h"
 
 #include "sync/internal_api/public/read_node.h"
 #include "sync/internal_api/public/write_transaction.h"
 #include "sync/syncable/directory.h"
 #include "sync/syncable/mutable_entry.h"
 #include "url/gurl.h"
 
 namespace syncer {
 
 SyncBackupManager::SyncBackupManager()
     : in_normalization_(false) {
 }
 
 SyncBackupManager::~SyncBackupManager() {
 }
 
 void SyncBackupManager::Init(InitArgs* args) {
   if (SyncRollbackManagerBase::InitInternal(
           args->database_location,
           args->internal_components_factory.get(),
           InternalComponentsFactory::STORAGE_ON_DISK_DEFERRED,
-          args->unrecoverable_error_handler.Pass(),
+          args->unrecoverable_error_handler,
           args->report_unrecoverable_error_function)) {
     GetUserShare()->directory->CollectMetaHandleCounts(
         &status_.num_entries_by_type, &status_.num_to_delete_entries_by_type);
 
     HideSyncPreference(PRIORITY_PREFERENCES);
     HideSyncPreference(PREFERENCES);
   }
 }
 
 void SyncBackupManager::SaveChanges() {
@@ skipping 100 matching lines @@
 
 bool SyncBackupManager::HasDirectoryTypeDebugInfoObserver(
     syncer::TypeDebugInfoObserver* observer) { return false; }
 
 void SyncBackupManager::RequestEmitDebugInfo() {}
 
 void SyncBackupManager::ClearServerData(
     const ClearServerDataCallback& callback) {}
 
 }  // namespace syncer