DidEnsureSyncRoot 1431 chrome/browser/sync_file_system/drive_backend_v1/drive_file_sync_service.cc       &DriveFileSyncService::DidEnsureSyncRoot, AsWeakPtr(), callback));
DidEnsureSyncRoot  328 chrome/browser/sync_file_system/drive_backend_v1/drive_file_sync_service.h   void DidEnsureSyncRoot(const ResourceIdCallback& callback,