Multi-select <select> in 'external popup window'

content/browser/renderer_host/popup_menu_helper_mac.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 CONTENT_BROWSER_RENDERER_HOST_POPUP_MENU_HELPER_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_POPUP_MENU_HELPER_MAC_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 15 matching lines @@
   explicit PopupMenuHelper(content::RenderViewHost* render_view_host);
 
   // Shows the popup menu and notifies the RenderViewHost of the selection/
   // cancel.
   // This call is blocking.
   void ShowPopupMenu(const gfx::Rect& bounds,
                      int item_height,
                      double item_font_size,
                      int selected_item,
                      const std::vector<WebMenuItem>& items,
-                     bool right_aligned);
+                     bool right_aligned,
+                     bool allow_multiple_selection);
 
  private:
   // content::NotificationObserver implementation:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   content::NotificationRegistrar notification_registrar_;
 
   content::RenderViewHostImpl* render_view_host_;
 
   DISALLOW_COPY_AND_ASSIGN(PopupMenuHelper);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_POPUP_MENU_HELPER_MAC_H_