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

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

Index: chrome/test/data/extensions/api_test/tabs/on_updated/historyPushStateUpdateUrl/a.js
diff --git a/ipc/ipc_message_attachment.cc b/chrome/test/data/extensions/api_test/tabs/on_updated/historyPushStateUpdateUrl/a.js
similarity index 50%
copy from ipc/ipc_message_attachment.cc
copy to chrome/test/data/extensions/api_test/tabs/on_updated/historyPushStateUpdateUrl/a.js
index 83440ae8e008847eebd411f8ffd08c69d9f529fe..ce3cdafde94a8cc72bccfbd5127426718b4656fc 100644
--- a/ipc/ipc_message_attachment.cc
+++ b/chrome/test/data/extensions/api_test/tabs/on_updated/historyPushStateUpdateUrl/a.js
@@ -2,14 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ipc/ipc_message_attachment.h"
-
-namespace IPC {
-
-MessageAttachment::MessageAttachment() {
+window.onload = function() {
+  // 'load' and 'complete' status is fired with the updated URL.
+  setTimeout(function() {
+    history.pushState(null, null, "#a");
+  }, 0);
 }
-
-MessageAttachment::~MessageAttachment() {
-}
-
-}  // namespace IPC