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

chrome/browser/download/download_item_model.cc

 // Copyright (c) 2010 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/download/download_item_model.h"
 
 #include "base/i18n/number_formatting.h"
 #include "base/i18n/rtl.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
@@ skipping 59 matching lines @@
               l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_STARTING) :
               FormatBytes(size, GetByteDisplayUnits(size), true);
         } else {
           status_text = l10n_util::GetStringFUTF16(
               IDS_DOWNLOAD_STATUS_IN_PROGRESS, simple_size, simple_total,
               simple_time);
         }
       }
       break;
     case DownloadItem::COMPLETE:
-      status_text.clear();
+      if (download_->file_externally_removed()) {
+        status_text = l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_REMOVED);
+      } else {
+        status_text.clear();
+      }
       break;
     case DownloadItem::CANCELLED:
       status_text = l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_CANCELED);
       break;
     case DownloadItem::REMOVING:
       break;
     case DownloadItem::INTERRUPTED:
       status_text = l10n_util::GetStringFUTF16(IDS_DOWNLOAD_STATUS_INTERRUPTED,
                                                simple_size,
                                                simple_total);
@@ skipping 42 matching lines @@
           IDS_SAVE_PAGE_STATUS_INTERRUPTED,
           base::FormatNumber(size),
           base::FormatNumber(total_size));
       break;
     default:
       NOTREACHED();
   }
 
   return status_text;
 }