Added "None available" title and grey out the media menu when there is no device.

chrome/browser/ui/gtk/content_setting_bubble_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/gtk/content_setting_bubble_gtk.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 239 matching lines @@
 
       // Store the gtk menu to the map.
       gtk_menu->menu_model.reset(new ContentSettingMediaMenuModel(
           gtk_menu->type,
           content_setting_bubble_model_.get(),
           base::Bind(&ContentSettingBubbleGtk::UpdateMenuLabel,
                      base::Unretained(this))));
       gtk_menu->menu.reset(new MenuGtk(NULL, gtk_menu->menu_model.get()));
       media_menus_[button] = gtk_menu;
 
+      if (!gtk_menu->menu_model->GetItemCount()) {
+        // Show a "None available" title and grey out the menu when there is no
+        // available device.
+        UpdateMenuLabel(
+            gtk_menu->type,
+            l10n_util::GetStringUTF8(IDS_MEDIA_MENU_NO_DEVICE_TITLE));
+        gtk_widget_set_sensitive(button, FALSE);
+      }
+
       // Use the longest width of the menus as the width of the menu buttons.
       GtkRequisition menu_req;
       gtk_widget_size_request(gtk_menu->menu->widget(), &menu_req);
       menu_width = std::max(menu_width, menu_req.width);
 
       g_signal_connect(button, "clicked", G_CALLBACK(OnMenuButtonClickedThunk),
                        this);
       gtk_table_attach(GTK_TABLE(table), button, 1, 2, row, row + 1,
                        GTK_FILL, GTK_FILL, ui::kControlSpacing * 2,
                        ui::kControlSpacing / 2);
@@ skipping 136 matching lines @@
   GtkMediaMenuMap::iterator i(media_menus_.find(button));
   DCHECK(i != media_menus_.end());
   i->second->menu->PopupForWidget(button, 1, gtk_get_current_event_time());
 }
 
 ContentSettingBubbleGtk::MediaMenuGtk::MediaMenuGtk(
     content::MediaStreamType type)
     : type(type) {}
 
 ContentSettingBubbleGtk::MediaMenuGtk::~MediaMenuGtk() {}