Remove web page replay based pyauto tests.

tools/page_cycler/webpagereplay/extension/content.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.
-
-// Hook onload and then add a timeout to send timing information
-// after the onload has completed.
-window.addEventListener('load', function() {
-    window.setTimeout(function() {
-        chrome.extension.sendRequest({
-            "timing": window.performance.timing,
-            "loadTimes": chrome.loadTimes(),
-        });
-    }, 0);
-}, false);