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

chrome/browser/ui/gtk/download/download_shelf_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/gtk/download/download_shelf_gtk.h"
 
 #include <string>
 
 #include "chrome/browser/download/download_item.h"
 #include "chrome/browser/download/download_item_model.h"
@@ skipping 268 matching lines @@
 GtkWidget* DownloadShelfGtk::GetHBox() const {
   return items_hbox_.get();
 }
 
 void DownloadShelfGtk::MaybeShowMoreDownloadItems() {
   // Show all existing download items. It'll trigger "size-allocate" signal,
   // which will hide download items that don't have enough space to show.
   gtk_widget_show_all(items_hbox_.get());
 }
 
+void DownloadShelfGtk::CheckForFilesRemoval() {
+  browser_->CheckForFilesRemoval();
+}
+
 void DownloadShelfGtk::OnButtonClick(GtkWidget* button) {
   if (button == close_button_->widget()) {
     Close();
   } else {
     // The link button was clicked.
     browser_->ShowDownloadsTab();
   }
 }
 
 void DownloadShelfGtk::AutoCloseIfPossible() {
@@ skipping 74 matching lines @@
 
   MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       auto_close_factory_.NewRunnableMethod(&DownloadShelfGtk::Close),
       kAutoCloseDelayMs);
 }
 
 void DownloadShelfGtk::MouseEnteredShelf() {
   auto_close_factory_.RevokeAll();
 }