Remove the shell_get_event_state() wrapper

The bug that this wrapper was working around has been fixed for quite some
time: https://bugzilla.gnome.org/show_bug.cgi?id=650329.

src/shell-util.c

@@ -592,25 +592,6 @@ shell_util_get_week_start ()
   return week_start;
 }
 
-/**
- * shell_get_event_state:
- * @event: a #ClutterEvent
- *
- * Gets the current state of the event (the set of modifier keys that
- * are pressed down). Thhis is a wrapper around
- * clutter_event_get_state() that strips out any un-declared modifier
- * flags, to make gjs happy; see
- * https://bugzilla.gnome.org/show_bug.cgi?id=597292.
- *
- * Return value: the state from the event
- */
-ClutterModifierType
-shell_get_event_state (ClutterEvent *event)
-{
-  ClutterModifierType state = clutter_event_get_state (event);
-  return state & CLUTTER_MODIFIER_MASK;
-}
-
 /**
  * shell_write_soup_message_to_stream:
  * @stream: a #GOutputStream

src/shell-util.h

@@ -25,9 +25,6 @@ char    *shell_util_normalize_and_casefold     (const char       *str);
 char    *shell_util_format_date                (const char       *format,
                                                 gint64            time_ms);
 
-ClutterModifierType
-         shell_get_event_state                 (ClutterEvent     *event);
-
 void     shell_write_soup_message_to_stream    (GOutputStream    *stream,
                                                 SoupMessage      *message,
                                                 GError          **error);