It is extension for GNOME Shell. It remove all search providers from overview, except for applications and settings.
URL: https://github.com/seleznev/gnome-shell-extension-remove-search-providers
Download archive from here and unpack it to ~/.local/share/gnome-shell/extensions/.
$ cd ~/.local/share/gnome-shell/extensions/
$ git clone git://github.com/seleznev/gnome-shell-extension-remove-search-providers.git
$ mv gnome-shell-extension-remove-search-providers/remove-search-providers@seleznev.github.com ./
$ rm -r gnome-shell-extension-remove-search-providers