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diff --git a/chrome/browser/webui/options/about_page_handler.h b/chrome/browser/webui/options/about_page_handler.h
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+++ b/chrome/browser/webui/options/about_page_handler.h
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+// Copyright (c) 2011 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_WEBUI_OPTIONS_ABOUT_PAGE_HANDLER_H_
+#define CHROME_BROWSER_WEBUI_OPTIONS_ABOUT_PAGE_HANDLER_H_
+
+#include <string>
+
+#include "chrome/browser/dom_ui/options/options_ui.h"
+
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/cros/update_library.h"
+#include "chrome/browser/chromeos/version_loader.h"
+#endif
+
+// ChromeOS about page UI handler.
+class AboutPageHandler : public OptionsPageUIHandler {
+ public:
+  AboutPageHandler();
+  virtual ~AboutPageHandler();
+
+  // OptionsUIHandler implementation.
+  virtual void GetLocalizedValues(DictionaryValue* localized_strings);
+  virtual void RegisterMessages();
+
+ private:
+  // The function is called from JavaScript when the about page is ready.
+  void PageReady(const ListValue* args);
+
+  // The function is called from JavaScript to set the release track like
+  // "beta-channel" and "dev-channel".
+  void SetReleaseTrack(const ListValue* args);
+
+#if defined(OS_CHROMEOS)
+  // Initiates update check.
+  void CheckNow(const ListValue* args);
+
+  // Restarts the system.
+  void RestartNow(const ListValue* args);
+
+  // Callback from chromeos::VersionLoader giving the version.
+  void OnOSVersion(chromeos::VersionLoader::Handle handle,
+                   std::string version);
+  void UpdateStatus(const chromeos::UpdateLibrary::Status& status);
+
+  // Handles asynchronously loading the version.
+  chromeos::VersionLoader loader_;
+
+  // Used to request the version.
+  CancelableRequestConsumer consumer_;
+
+  // Update Observer
+  class UpdateObserver;
+  scoped_ptr<UpdateObserver> update_observer_;
+
+  int progress_;
+  bool sticky_;
+  bool started_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(AboutPageHandler);
+};
+
+#endif  // CHROME_BROWSER_WEBUI_OPTIONS_ABOUT_PAGE_HANDLER_H_