[Downloads] Do not store error responses during resumption.

content/browser/download/download_item_impl.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.
 
 // File method ordering: Methods in this file are in the same order as
 // in download_item_impl.h, with the following exception: The public
 // interface Start is placed in chronological order with the other
 // (private) routines that together define a DownloadItem's state
 // transitions as the download progresses.  See "Download progression
 // cascade" later in this file.
@@ skipping 898 matching lines @@
       if (force_user)
         mode = RESUME_MODE_USER_RESTART;
       else
         mode = RESUME_MODE_IMMEDIATE_RESTART;
       break;
 
     case DOWNLOAD_INTERRUPT_REASON_NETWORK_FAILED:
     case DOWNLOAD_INTERRUPT_REASON_NETWORK_DISCONNECTED:
     case DOWNLOAD_INTERRUPT_REASON_NETWORK_SERVER_DOWN:
     case DOWNLOAD_INTERRUPT_REASON_SERVER_FAILED:
+    case DOWNLOAD_INTERRUPT_REASON_SERVER_UNREACHABLE:
     case DOWNLOAD_INTERRUPT_REASON_USER_SHUTDOWN:
     case DOWNLOAD_INTERRUPT_REASON_CRASH:
       if (force_restart)
         mode = RESUME_MODE_USER_RESTART;
       else
         mode = RESUME_MODE_USER_CONTINUE;
       break;
 
     case DOWNLOAD_INTERRUPT_REASON_FILE_FAILED:
     case DOWNLOAD_INTERRUPT_REASON_FILE_ACCESS_DENIED:
@@ skipping 1096 matching lines @@
     case RESUME_MODE_USER_CONTINUE:
       return "USER_CONTINUE";
     case RESUME_MODE_USER_RESTART:
       return "USER_RESTART";
   }
   NOTREACHED() << "Unknown resume mode " << mode;
   return "unknown";
 }
 
 }  // namespace content