separate about page into its own page (included in chrome://chrome)

chrome/browser/ui/webui/about_page/about_page_ui.h

+// 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_UI_WEBUI_ABOUT_PAGE_ABOUT_PAGE_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_ABOUT_PAGE_ABOUT_PAGE_UI_H_
+#pragma once
+
+#include "content/browser/webui/web_ui.h"
+
+class AboutPageUI : public WebUI {
+ public:
+  explicit AboutPageUI(content::WebContents* contents);
+  virtual ~AboutPageUI();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AboutPageUI);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_ABOUT_PAGE_ABOUT_PAGE_UI_H_