gtk: Split DownloadShelfContextMenuGtk out to its own header file.

chrome/browser/ui/gtk/download/download_shelf_context_menu_gtk.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_GTK_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_GTK_H_
+#define CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_GTK_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/download/download_shelf_context_menu.h"
+#include "chrome/browser/ui/gtk/menu_gtk.h"
+
+class BaseDownloadItemModel;
+class DownloadItemGtk;
+
+class DownloadShelfContextMenuGtk : public DownloadShelfContextMenu,
+                                    public MenuGtk::Delegate {
+ public:
+  DownloadShelfContextMenuGtk(BaseDownloadItemModel* model,
+                              DownloadItemGtk* download_item);
+  virtual ~DownloadShelfContextMenuGtk();
+
+  void Popup(GtkWidget* widget, GdkEventButton* event);
+
+ private:
+  // MenuGtk::Delegate:
+  virtual void StoppedShowing() OVERRIDE;
+  virtual GtkWidget* GetImageForCommandId(int command_id) const OVERRIDE;
+
+  // The menu we show on Popup(). We keep a pointer to it for a couple reasons:
+  //  * we don't want to have to recreate the menu every time it's popped up.
+  //  * we have to keep it in scope for longer than the duration of Popup(), or
+  //    completing the user-selected action races against the menu's
+  //    destruction.
+  scoped_ptr<MenuGtk> menu_;
+
+  // The download item that created us.
+  DownloadItemGtk* download_item_gtk_;
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadShelfContextMenuGtk);
+};
+
+#endif  // CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_SHELF_CONTEXT_MENU_GTK_H_