Remove deprecated sync record field Bookmark.index
Remove deprecated sync record field Bookmark.index

Related: https://github.com/brave/sync/pull/56

timborden/browser-laptop,timborden/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop