Detect removed files and reflect the state in chrome://downloads and the download shelf

chrome/browser/ui/gtk/download/download_item_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_ITEM_GTK_H_
 #define CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_ITEM_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 142 matching lines @@
   // The shelf on which we are displayed.
   DownloadShelfGtk* parent_shelf_;
 
   // The widget that contains the body and menu dropdown.
   OwnedWidgetGtk hbox_;
 
   // The widget that contains the name of the download and the progress
   // animation.
   OwnedWidgetGtk body_;
 
+  // The widget that contains the texts of |name_label_| and |status_label_|.
+  GtkWidget* text_stack_;
+
   // The GtkLabel that holds the download title text.
   GtkWidget* name_label_;
 
   // The GtkLabel that holds the status text.
   GtkWidget* status_label_;
 
   // The current text of status label
   std::string status_text_;
 
   // The widget that creates a dropdown menu when pressed.
@@ skipping 59 matching lines @@
 
   // For canceling an in progress icon request.
   CancelableRequestConsumerT<int, 0> icon_consumer_;
 
   // Indicates when the download has completed, so we don't redo
   // on-completion actions.
   bool download_complete_;
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_DOWNLOAD_DOWNLOAD_ITEM_GTK_H_