Added callback to DownloadUrl() so we can find download failures.

chrome/browser/chromeos/imageburner/burn_manager.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.
 
 #include "chrome/browser/chromeos/imageburner/burn_manager.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
@@ skipping 356 matching lines @@
 
     download_util::RecordDownloadSource(
         download_util::INITIATED_BY_IMAGE_BURNER);
     download_manager->DownloadUrl(
         url,
         web_contents->GetURL(),
         web_contents->GetEncoding(),
         false,
         -1,
         save_info,
-        web_contents);
+        web_contents,
+        DownloadManager::OnStartedCallback());
   } else {
     DownloadStarted(false, url);
   }
 }
 
 void Downloader::AddListener(Listener* listener, const GURL& url) {
   listeners_.insert(std::make_pair(url, listener->AsWeakPtr()));
 }
 
 void Downloader::DownloadStarted(bool success, const GURL& url) {
   std::pair<ListenerMap::iterator, ListenerMap::iterator> listener_range =
       listeners_.equal_range(url);
   for (ListenerMap::iterator current_listener = listener_range.first;
        current_listener != listener_range.second;
        ++current_listener) {
     if (current_listener->second)
       current_listener->second->OnBurnDownloadStarted(success);
   }
   listeners_.erase(listener_range.first, listener_range.second);
 }
 
 }  // namespace imageburner
 }  // namespace chromeos