Borra reimplementacion de cancel button

ContactsApp/ContactsViewController.swift

@@ -160,12 +160,6 @@ extension ContactsViewController: UISearchBarDelegate, UISearchDisplayDelegate,
         self.searchBar.resignFirstResponder()
     }
 
-    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
-        self.searchBar.text = ""
-        self.searchBarTextDidEndEditing(searchBar)
-        self.searchBar.resignFirstResponder()
-    }
-
     func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
         print(searchText)
     }