(Fmake_terminal_frame): Use SELECTED_FRAME.

(Fmake_terminal_frame): Use SELECTED_FRAME.
(do_switch_frame): Change for Lisp_Object selected_frame.
(Fselected_frame): Ditto.
(Fframe_first_window): Use SELECTED_FRAME.
(Fframe_root_window): Change for Lisp_Object selected_frame.
(Fframe_selected_window, Fset_frame_selected_window, Fnext_frame,
Fprevious_frame, other_visible_frames, Fdelete_frame,
Fmouse_position, Fmouse_pixel_position, Fmake_frame_visible,
Fmake_frame_invisible, Ficonify_frame, Fraise_frame, Flower_frame,
Fframe_parameters, Fmodify_frame_parameters, Fframe_char_height,
Fframe_char_width, Fframe_pixel_height, Fframe_pixel_width,
Fset_frame_height, Fset_frame_width): Ditto.