Remove pyauto tests.

chrome/test/functional/ispy/client/wait_on_ajax.js

-// Copyright 2013 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.
-
-var target = document.body;
-var callback = arguments[arguments.length - 1]
-
-var timeout_id = setTimeout(function() {
-  callback()
-}, 5000);
-
-var observer = new MutationObserver(function(mutations) {
-  clearTimeout(timeout_id);
-  timeout_id = setTimeout(function() {
-    callback();
-  }, 5000);
-}).observe(target, {attributes: true, childList: true,
-  characterData: true, subtree: true});