use modern (2018) pattern for modules

src/browser/header/tray.rs

@@ -0,0 +1,33 @@
+mod menu;
+mod tab;
+
+use gtk::prelude::BoxExt;
+use gtk::{Box, Orientation};
+use menu::Menu;
+use tab::Tab;
+
+pub struct Tray {
+    widget: Box,
+}
+
+impl Tray {
+    pub fn new() -> Self {
+        let menu = Menu::new();
+        let tab = Tab::new();
+
+        let widget = Box::builder()
+            .orientation(Orientation::Horizontal)
+            .spacing(8)
+            .build();
+
+        widget.append(menu.widget());
+        widget.append(tab.widget());
+
+        Self { widget }
+    }
+
+    // Getters
+    pub fn widget(&self) -> &Box {
+        &self.widget
+    }
+}