Hide live chat by default on YouTube live streams

hide_live_chat.js

// ==UserScript==
// @name         YouTube - Hide Live Chat
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Hide live chat by default on live streams
// @author       LM
// @match        https://www.youtube.com/watch*
// @run-at       document-end
// @grant        none
// ==/UserScript==

function AddClass() {
    var el = document.getElementById("live-chat-iframe");
    if(el) {
        el.parentElement.classList.add("yt-uix-expander-collapsed");
        console.log('Hide Live Chat');
        return true;
    }
    return false;
}

function KeepTrying(func, attempts, delay) {
    console.log('Keep Trying ' + attempts);
    if( !func() && attempts-1 > 0 ) {
        window.setTimeout( function() {
            KeepTrying(func, attempts-1, delay);
        });
    }
}

(function() {
    'use strict';

    KeepTrying( AddClass, 5, 10 );

})();

Continuing this in https://gist.github.com/lbmaian/94824cef728917a53d3c6e6ea885469c