chore: remove unused theme methods

lib/models/theme.dart

@@ -213,18 +213,7 @@ class ThemeModel with ChangeNotifier {
     }
   }
 
-  pushGitlab(BuildContext context, String url, {bool replace = false}) {
-    if (url.startsWith('/')) {
-      push(context, '/gitlab/$url', replace: replace);
-    } else {
-      launchUrl(url);
-    }
-  }
-
   Future<bool> showConfirm(BuildContext context, Widget content) {
-    switch (theme) {
-      case AppThemeType.cupertino:
-      default:
     return showCupertinoDialog(
       context: context,
       builder: (context) {
@@ -272,7 +261,6 @@ class ThemeModel with ChangeNotifier {
     //     },
     //   );
   }
-  }
 
   Future<T> showDialogOptions<T>(
       BuildContext context, List<DialogOption<T>> options) {
@@ -332,33 +320,10 @@ class ThemeModel with ChangeNotifier {
     }
   }
 
-  showSelector<T>({
-    @required BuildContext context,
-    @required Iterable<SelectorItem<T>> items,
-    @required T selected,
-  }) async {
-    switch (theme) {
-      case AppThemeType.cupertino:
-      default:
-        return showMenu<T>(
-          context: context,
-          initialValue: selected,
-          items: items
-              .map((item) =>
-                  PopupMenuItem(value: item.value, child: Text(item.text)))
-              .toList(),
-          position: RelativeRect.fromLTRB(1, 10, 0, 0),
-        );
-    }
-  }
-
   static Timer _debounce;
   String _selectedItem;
 
   showPicker(BuildContext context, PickerGroupItem<String> groupItem) async {
-    switch (theme) {
-      case AppThemeType.cupertino:
-      default:
     await showCupertinoModalPopup(
       context: context,
       builder: (context) {
@@ -396,7 +361,6 @@ class ThemeModel with ChangeNotifier {
       groupItem.onClose(_selectedItem);
     }
   }
-  }
 
   showActions(BuildContext context, List<ActionItem> actionItems) async {
     if (actionItems == null) return;