Implement a background downloader using BITS in Windows Chrome.

chrome/browser/component_updater/component_updater_utils.cc

 // Copyright 2013 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/component_updater/component_updater_utils.h"
 #include "base/guid.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "base/win/windows_version.h"
 #include "chrome/common/chrome_version_info.h"
@@ skipping 84 matching lines @@
       // Network errors are small negative numbers.
       const int error = fetcher.GetStatus().error();
       return error ? error : -1;
     }
 
     default:
       return -1;
   }
 }
 
+
+bool IsHttpServerError(int status_code) {
+  return 500 <= status_code && status_code < 600;
+}
+
 }  // namespace component_updater