* lisp/frame.el (handle-focus-in, handle-focus-out): Move from frame.c.

* lisp/frame.el (handle-focus-in, handle-focus-out): Move from frame.c.
Remove blink-cursor code.
(blink-cursor-timer-function, blink-cursor-suspend): Don't special-case GUIs.
(blink-cursor-mode): Use focus-in/out-hook.
* src/frame.c (Fhandle_focus_in, Fhandle_focus_out): Move to frame.el.
(syms_of_frame): Don't defsubr them.