Refactor the about:version code out of about_ui.

chrome/browser/ui/webui/version_handler.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_VERSION_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_VERSION_HANDLER_H_
+
+#include <vector>
+
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "content/public/browser/web_ui_message_handler.h"
+#include "webkit/plugins/webplugininfo.h"
+
+// Handler class for Version page operations.
+class VersionHandler : public content::WebUIMessageHandler {
+ public:
+  VersionHandler();
+  virtual ~VersionHandler();
+
+  // content::WebUIMessageHandler implementation.
+  virtual void RegisterMessages() OVERRIDE;
+
+  // Callback for the "requestVersionInfo" message. This asynchronously requests
+  // the flash version and eventually returns it to the front end along with the
+  // list of variations using OnGotPlugins.
+  virtual void HandleRequestVersionInfo(const ListValue* args);
+
+ private:
+  // Callback which handles returning the executable and profile paths to the
+  // front end.
+  void OnGotFilePaths(string16* executable_path_data,
+                      string16* profile_path_data);
+
+  // Callback for GetPlugins which responds to the page with the Flash version.
+  // This also initiates the OS Version load on ChromeOS.
+  void OnGotPlugins(const std::vector<webkit::WebPluginInfo>& plugins);
+
+  // Factory for the creating refs in callbacks.
+  base::WeakPtrFactory<VersionHandler> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(VersionHandler);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_VERSION_HANDLER_H_