/usr/share/vim-scripts/autoload/omni/ is in vim-scripts 20130814.
This file is owned by root:root, with mode 0o755.
..
/usr/share/vim-scripts/autoload/omni/common/
/usr/share/vim-scripts/autoload/omni/common/debug.vim
/usr/share/vim-scripts/autoload/omni/common/utils.vim
/usr/share/vim-scripts/autoload/omni/cpp/
/usr/share/vim-scripts/autoload/omni/cpp/complete.vim
/usr/share/vim-scripts/autoload/omni/cpp/includes.vim
/usr/share/vim-scripts/autoload/omni/cpp/items.vim
/usr/share/vim-scripts/autoload/omni/cpp/maycomplete.vim
/usr/share/vim-scripts/autoload/omni/cpp/namespaces.vim
/usr/share/vim-scripts/autoload/omni/cpp/settings.vim
/usr/share/vim-scripts/autoload/omni/cpp/tokenizer.vim
/usr/share/vim-scripts/autoload/omni/cpp/utils.vim