Use gtk_toggle_button_get_active()

atom/browser/ui/message_box_gtk.cc

@@ -197,7 +197,7 @@ void GtkMessageBox::OnResponseDialog(GtkWidget* widget, int response) {
 }
 
 void GtkMessageBox::OnCheckboxToggled(GtkWidget* widget) {
-  checkbox_checked_ = GTK_TOGGLE_BUTTON(widget)->active;
+  checkbox_checked_ = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
 }
 
 }  // namespace