The successor in office for the time being of such pastor shall, by virtue of his office, be the trustee of such church or congregation in place of his predecessor. The office of any of the trustees shall become vacant by his removal out of the limits of the church or congregation, and whenever the office of any trustee, except the pastor, shall become vacant for any reason whatsoever, his successor shall be chosen in the manner herein provided for the selection of the original members of the board of trustees.