Remove unused methods

Trust/Extensions/UIViewController.swift

@@ -45,18 +45,4 @@ extension UIViewController {
     func hideLoading(animated: Bool = true) {
         MBProgressHUD.hide(for: view, animated: animated)
     }
-
-    func add(asChildViewController viewController: UIViewController) {
-        addChildViewController(viewController)
-        view.addSubview(viewController.view)
-        viewController.view.frame = view.bounds
-        viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
-        viewController.didMove(toParentViewController: self)
-    }
-
-    func remove(asChildViewController viewController: UIViewController) {
-        viewController.willMove(toParentViewController: nil)
-        viewController.view.removeFromSuperview()
-        viewController.removeFromParentViewController()
-    }
 }