About page should not automatically trigger OS updates

chrome/browser/ui/webui/help/version_updater_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_CHROMEOS_H_
 #define CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_CHROMEOS_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/ui/webui/help/version_updater.h"
 #include "chromeos/dbus/update_engine_client.h"
 
 class VersionUpdaterCros : public VersionUpdater,
                            public chromeos::UpdateEngineClient::Observer {
  public:
   // VersionUpdater implementation.
   virtual void CheckForUpdate(const StatusCallback& callback) OVERRIDE;
   virtual void RelaunchBrowser() const OVERRIDE;
   virtual void SetChannel(const std::string& channel,
                           bool is_powerwash_allowed) OVERRIDE;
   virtual void GetChannel(bool get_current_channel,
                           const ChannelCallback& callback) OVERRIDE;
 
+  // Gets the last update status, without triggering a new check or download.
+  void GetUpdateStatus(const StatusCallback& callback);
+
  protected:
   friend class VersionUpdater;
 
   // Clients must use VersionUpdater::Create().
   VersionUpdaterCros();
   virtual ~VersionUpdaterCros();
 
  private:
   // UpdateEngineClient::Observer implementation.
   virtual void UpdateStatusChanged(
       const chromeos::UpdateEngineClient::Status& status) OVERRIDE;
 
   // Callback from UpdateEngineClient::RequestUpdateCheck().
   void OnUpdateCheck(chromeos::UpdateEngineClient::UpdateCheckResult result);
 
   // Callback used to communicate update status to the client.
   StatusCallback callback_;
 
   // Last state received via UpdateStatusChanged().
   chromeos::UpdateEngineClient::UpdateStatusOperation last_operation_;
 
   base::WeakPtrFactory<VersionUpdaterCros> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VersionUpdaterCros);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_CHROMEOS_H_