Replace autospurdo code to use cloudtobutt's textnode walker

autoSpurdo.js

// ==UserScript==
// @name autoSpurdo
// @description Convert text on every page into spurdo
// @namespace installgen2
// @include *
// @version 4
// @grant none
// ==/UserScript==
walk(document.body);
function walk(node)
{
  // I stole this function from here:
  // http://is.gd/mwZp7E
  var child,
  next;
  switch (node.nodeType)
    {
    case 1: // Element
    case 9: // Document
    case 11: // Document fragment
      child = node.firstChild;
      while (child)
      {
        next = child.nextSibling;
        walk(child);
        child = next;
      }
      break;
    case 3: // Text node
      spurdoNode(node);
      break;
  }
}
function spurdoNode(node) {
  var text = node.nodeValue;
  var replacements = [
    ['wh',
    'w'],
    [
      'th',
      'd'
    ],
    [
      'af',
      'ab'
    ],
    [
      'ap',
      'ab'
    ],
    [
      'ca',
      'ga'
    ],
    [
      'ck',
      'gg'
    ],
    [
      'co',
      'go'
    ],
    [
      'ev',
      'eb'
    ],
    [
      'ex',
      'egz'
    ],
    [
      'et',
      'ed'
    ],
    [
      'iv',
      'ib'
    ],
    [
      'it',
      'id'
    ],
    [
      'ke',
      'ge'
    ],
    [
      'nt',
      'nd'
    ],
    [
      'op',
      'ob'
    ],
    [
      'ot',
      'od'
    ],
    [
      'po',
      'bo'
    ],
    [
      'pe',
      'be'
    ],
    [
      'pi',
      'bi'
    ],
    [
      'up',
      'ub'
    ],
    [
      'va',
      'ba'
    ],
    [
      'ck',
      'gg'
    ],
    [
      'cr',
      'gr'
    ],
    [
      'kn',
      'gn'
    ],
    [
      'lt',
      'ld'
    ],
    [
      'mm',
      'm'
    ],
    [
      'nt',
      'dn'
    ],
    [
      'pr',
      'br'
    ],
    [
      'ts',
      'dz'
    ],
    [
      'tr',
      'dr'
    ],
    [
      'bs',
      'bz'
    ],
    [
      'ds',
      'dz'
    ],
    [
      'es',
      'es'
    ],
    [
      'fs',
      'fz'
    ],
    [
      'gs',
      'gz'
    ],
    [
      ' is',
      ' iz'
    ],
    [
      'ls',
      'lz'
    ],
    [
      'ms',
      'mz'
    ],
    [
      'ns',
      'nz'
    ],
    [
      'rs',
      'rz'
    ],
    [
      'ss',
      'sz'
    ],
    [
      'ts',
      'tz'
    ],
    [
      'us',
      'uz'
    ],
    [
      'ws',
      'wz'
    ],
    [
      'ys',
      'yz'
    ],
    [
      'alk',
      'olk'
    ],
    [
      'ing',
      'ign'
    ],
    [
      'ic',
      'ig'
    ],
    [
      'ng',
      'nk'
    ],
    [
      'kek',
      'geg'
    ],
    [
      'epic',
      'ebin'
    ],
    [
      'some',
      'sum'
    ],
    [
      'meme',
      'maymay'
    ],
  ];
  var ebinFaces = [
    ':D',
    ':DD',
    ':DDD',
    ':-D',
    'XD',
    'XXD',
    'XDD',
    'XXDD'
  ];
  function getEbinFace() {
    return ebinFaces[Math.floor(Math.random() * ebinFaces.length)];
  }
  text = text.toLowerCase();
  replacements.forEach(function (filter) {
    var replaceFrom = new RegExp(filter[0], 'gm'),
    replaceTo = filter[1];
    text = text.replace(replaceFrom, replaceTo);
  });
  while (text.match(/\.|,(?=\s|$)/m)) {
    text = text.replace(/\.|,(?=\s|$)/m, ' ' + getEbinFace());
  }
//   var ebinFaceFound = false;
//   ebinFaces.forEach(function (face) {
//     if (text.indexOf(face) != - 1) {
//       ebinFaceFound = true;
//     }
//   });
//   if (!ebinFaceFound) {
//     text += ' ' + getEbinFace();
//   }
  node.nodeValue = text;
}