(pre-command-hook, post-command-hook): Defvars deleted.

(pre-command-hook, post-command-hook): Defvars deleted.
(post-command-idle-hook): Defvar deleted.
(edebug-outside-post-command-idle-hook): Defvar deleted.
(edebug-enter): Don't look at or set post-command-idle-hook.
(edebug-outside-excursion): Likewise.
(edebug-emacs-19-specific): Don't define read-expression-history
and read-expression-map.