Change variable FIND-FILE-HOOKS to be a list. The procedures in this

Change variable FIND-FILE-HOOKS to be a list.  The procedures in this
list are called in order, and each must return a buffer, which may be
different form the argument.  The resulting buffer is to be used in
place of the argument buffer.  This affects the result of
FIND-FILE-NOSELECT, AFTER-FIND-FILE, FIND-FILE-REVERT, and
REVERT-BUFFER.