chrome.tabs.onUpdated doesn't called with 'loading' twice.

chrome/test/data/extensions/api_test/tabs/on_updated/historyPushStateUpdateUrl/a.js

 // Copyright (c) 2015 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.
 
-#include "media/base/video_capturer_source.h"
-
-namespace media {
-
-VideoCapturerSource::~VideoCapturerSource() {}
-
-}  // namespace media
+window.onload = function() {
+  // 'load' status is fired with a updated URL.
+  setTimeout(function() {
+    history.pushState(null, null, "#a");
+  }, 0);
+}