(activate_scroll_bars, deactivate_scroll_bars): Remove functions and

(activate_scroll_bars, deactivate_scroll_bars): Remove functions and
declarations.
(mac_set_colors): Take argument for saving background color.  All
callers changed.
(XDrawLine, XClearArea, mac_draw_bitmap, XFillRectangle)
(mac_draw_rectangle, mac_draw_string_common): Save and Restore
background color.
(x_update_end, mac_do_track_drag): Don't reset background color.
(mac_define_frame_cursor) [!TARGET_API_MAC_CARBON]: Use
SetThemeCursor.
(x_set_window_size) [TARGET_API_MAC_CARBON]: Move progress indicator
control to the upper-right corner of the window.
(arrow_cursor) [!TARGET_API_MAC_CARBON]: Remove variable.
(do_init_managers) [!TARGET_API_MAC_CARBON]: Don't initialize it.
(do_window_update): Update controls after updating content area.
(mac_handle_window_event): Remove unused extern.
(XTread_socket): Check both control handle and control part code to
determine whether a scroll bar is clicked.  Activate/deactivate root
control instead of contained scroll bar controls.
(make_mac_terminal_frame): Use ThemeCursor constants.