[Resumption 6/11] Add a RESUMING_INTERNAL state to DownloadItem.

content/browser/download/download_resource_handler.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 "content/browser/download/download_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 47 matching lines @@
     // NULL in unittests or if the page closed right after starting the
     // download.
     if (!started_cb.is_null())
       started_cb.Run(NULL, net::ERR_ACCESS_DENIED);
     return;
   }
 
   DownloadItem* item = download_manager->StartDownload(
       info.Pass(), stream.Pass());
 
+  // |item| can be NULL if the download has been removed.
   if (!started_cb.is_null())
-    started_cb.Run(item, net::OK);
+    started_cb.Run(item, item ? net::OK : net::ERR_ABORTED);
 }
 
 }  // namespace
 
 const int DownloadResourceHandler::kDownloadByteStreamSize = 100 * 1024;
 
 DownloadResourceHandler::DownloadResourceHandler(
     DownloadId id,
     net::URLRequest* request,
     const DownloadResourceHandler::OnStartedCallback& started_cb,
@@ skipping 401 matching lines @@
 
   // Remove output stream callback if a stream exists.
   if (stream_writer_)
     stream_writer_->RegisterCallback(base::Closure());
 
   UMA_HISTOGRAM_TIMES("SB2.DownloadDuration",
                       base::TimeTicks::Now() - download_start_time_);
 }
 
 }  // namespace content