Deprecate most of gaia_auth extension

chrome/browser/resources/gaia_auth/util.js

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * Alias for document.getElementById.
- * @param {string} id The ID of the element to find.
- * @return {HTMLElement} The found element or null if not found.
- */
-function $(id) {
-  return document.getElementById(id);
-}
-
-/**
- * Creates a new URL which is the old URL with a GET param of key=value.
- * Copied from ui/webui/resources/js/util.js.
- * @param {string} url The base URL. There is not sanity checking on the URL so
- *     it must be passed in a proper format.
- * @param {string} key The key of the param.
- * @param {string} value The value of the param.
- * @return {string} The new URL.
- */
-function appendParam(url, key, value) {
-  var param = encodeURIComponent(key) + '=' + encodeURIComponent(value);
-
-  if (url.indexOf('?') == -1)
-    return url + '?' + param;
-  return url + '&' + param;
-}
-
-/**
- * Creates a new URL by striping all query parameters.
- * @param {string} url The original URL.
- * @return {string} The new URL with all query parameters stripped.
- */
-function stripParams(url) {
-  return url.substring(0, url.indexOf('?')) || url;
-}
-
-/**
- * Extract domain name from an URL.
- * @param {string} url An URL string.
- * @return {string} The host name of the URL.
- */
-function extractDomain(url) {
-  var a = document.createElement('a');
-  a.href = url;
-  return a.hostname;
-}