remove betterttv clear message quickfix

// ==UserScript==
// @id          @https://gist.github.com/vincentsimard/baf8d8ee6bcc5ca929f3/
// @name        Remove slow/clear messages from betterttv
// @namespace   https://gist.github.com/vincentsimard/
// @description 
// @author      vincentsimard
// @copyright   2015+, vincentsimard
// @license     WTFPL
// @downloadURL https://gist.githubusercontent.com/vincentsimard/baf8d8ee6bcc5ca929f3/raw/
// @updateURL   https://gist.githubusercontent.com/vincentsimard/baf8d8ee6bcc5ca929f3/raw/
// @supportURL  
// @version     0.2
// @match       http://*.twitch.tv/*
// @grant       none
// @icon        
// ==/UserScript==

// @TODO: Change way to wait for .chat-lines to load on page instead of using setTimeout
setTimeout(function() {
  document.querySelector('.chat-lines').addEventListener('DOMNodeInserted', function(e) {
    var target = e.target;
    var isUnwantedText;
    var matches = function(el, selector) {
      return (el.matches || el.matchesSelector || el.msMatchesSelector || el.mozMatchesSelector || el.webkitMatchesSelector || el.oMatchesSelector).call(el, selector);
    };
    
    if (matches(target, '.chat-line')) {
      isUnwantedText = document.querySelectorAll('[data-raw^="This%20room%20is%20now%20in%20slow%20mode"], [data-raw="Chat%20was%20cleared%20by%20a%20moderator%20(Prevented%20by%20BetterTTV)"]', target).length > 0;
      if (isUnwantedText) { target.parentNode.removeChild(target); }
    }
  });
}, 5000);