drop deprecated method

src/app/browser/window/tab/item/page/navigation/widget.rs

@@ -1,7 +1,4 @@
-use gtk::{
-    prelude::{BoxExt, WidgetExt},
-    Box, Button, DirectionType, Entry, Orientation,
-};
+use gtk::{prelude::BoxExt, Box, Button, Entry, Orientation};
 use std::sync::Arc;
 
 pub struct Widget {
@@ -34,11 +31,6 @@ impl Widget {
         Arc::new(Self { gobject })
     }
 
-    // Actions
-    pub fn focus(&self) {
-        self.gobject.child_focus(DirectionType::Right);
-    }
-
     // Getters
     pub fn gobject(&self) -> &Box {
         &self.gobject