Make the bookmark toolbar folders act like a menu bar....

chrome/browser/gtk/bookmark_menu_controller_gtk.h

 // Copyright (c) 2009 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_GTK_BOOKMARK_MENU_CONTROLLER_GTK_H_
 #define CHROME_BROWSER_GTK_BOOKMARK_MENU_CONTROLLER_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <map>
@@ skipping 17 matching lines @@
   // at index |start_child_index|.
   BookmarkMenuController(Browser* browser,
                          Profile* profile,
                          PageNavigator* page_navigator,
                          GtkWindow* window,
                          const BookmarkNode* node,
                          int start_child_index,
                          bool show_other_folder);
   virtual ~BookmarkMenuController();
 
+  GtkWidget* widget() { return menu_; }
+
   // Pops up the menu. |widget| must be a GtkChromeButton.
   void Popup(GtkWidget* widget, gint button_type, guint32 timestamp);
 
   // Overridden from BaseBookmarkModelObserver:
   virtual void BookmarkModelChanged();
   virtual void BookmarkNodeFavIconLoaded(BookmarkModel* model,
                                          const BookmarkNode* node);
 
  private:
   // Recursively change the bookmark hierarchy rooted in |parent| into a set of
@@ skipping 49 matching lines @@
   // The bookmark model.
   BookmarkModel* model_;
 
   // The node we're showing the contents of.
   const BookmarkNode* node_;
 
   // Our bookmark menus. We don't use the MenuGtk class because we have to do
   // all sorts of weird non-standard things with this menu, like:
   // - The menu is a drag target
   // - The menu items have context menus.
-  OwnedWidgetGtk menu_;
+  GtkWidget* menu_;
 
   // Whether we should ignore the next button release event (because we were
   // dragging).
   bool ignore_button_release_;
 
   // The widget we are showing for (i.e. the bookmark bar folder button).
   GtkWidget* triggering_widget_;
 
   // Mapping from node to GtkMenuItem menu id. This only contains entries for
   // nodes of type URL.
   std::map<const BookmarkNode*, GtkWidget*> node_to_menu_widget_map_;
 
   // Owns our right click context menu.
   scoped_ptr<BookmarkContextMenu> context_menu_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkMenuController);
 };
 
 #endif  // CHROME_BROWSER_GTK_BOOKMARK_MENU_CONTROLLER_GTK_H_