Fix to ensure IO thread is created when ExtensionUpdater needs it....

chrome/browser/extensions/extensions_service.cc

 // Copyright (c) 2009 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 "chrome/browser/extensions/extensions_service.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/string_util.h"
 #include "base/values.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_browser_event_router.h"
 #include "chrome/browser/extensions/extension_dom_ui.h"
 #include "chrome/browser/extensions/extension_file_util.h"
 #include "chrome/browser/extensions/extension_updater.h"
 #include "chrome/browser/extensions/external_extension_provider.h"
 #include "chrome/browser/extensions/external_pref_extension_provider.h"
 #include "chrome/browser/profile.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 85 matching lines @@
   }
 
   // Set up the ExtensionUpdater
   if (autoupdate_enabled) {
     int update_frequency = kDefaultUpdateFrequencySeconds;
     if (command_line->HasSwitch(switches::kExtensionsUpdateFrequency)) {
       update_frequency = StringToInt(WideToASCII(command_line->GetSwitchValue(
           switches::kExtensionsUpdateFrequency)));
     }
     updater_ = new ExtensionUpdater(this, prefs, update_frequency,
-        backend_loop_, ChromeThread::GetMessageLoop(ChromeThread::IO));
+        backend_loop_, g_browser_process->io_thread()->message_loop());
   }
 
   backend_ = new ExtensionsServiceBackend(install_directory_, frontend_loop);
 }
 
 ExtensionsService::~ExtensionsService() {
   UnloadAllExtensions();
   if (updater_.get()) {
     updater_->Stop();
   }
@@ skipping 573 matching lines @@
       linked_ptr<ExternalExtensionProvider>(test_provider);
 }
 
 void ExtensionsServiceBackend::OnExternalExtensionFound(
     const std::string& id, const Version* version, const FilePath& path,
     Extension::Location location) {
   frontend_loop_->PostTask(FROM_HERE, NewRunnableMethod(frontend_,
       &ExtensionsService::OnExternalExtensionFound, id, version->GetString(),
       path, location));
 }