How to Hide the "Google+ Page Badge" Admin Menu

function plt_hide_google_plus_page_badge_menus() {
	//Hide the "Settings → Google+ Page Badge" menu.
	remove_submenu_page('options-general.php', 'googlepb');
}

add_action('admin_menu', 'plt_hide_google_plus_page_badge_menus', 11);

Where do I put this code?