@Override
 protected void onDestroy() {
   mEnhancedBookmarksModel.removeObserver(mBookmarkModelObserver);
   mEnhancedBookmarksModel.destroy();
   mEnhancedBookmarksModel = null;
   super.onDestroy();
 }
 @Override
 protected void onDestroy() {
   recordOfflineButtonAction(false);
   if (OfflinePageBridge.isEnabled()) {
     mEnhancedBookmarksModel.getOfflinePageBridge().removeObserver(mOfflinePageModelObserver);
   }
   mEnhancedBookmarksModel.removeObserver(mBookmarkModelObserver);
   mEnhancedBookmarksModel.destroy();
   mEnhancedBookmarksModel = null;
   super.onDestroy();
 }
 @Override
 protected void onDestroy() {
   super.onDestroy();
   mBookmarkManager.destroy();
   mSnackbarManager.dismissSnackbar(false);
 }