Clean up WebKit resources after starting a download

chrome/browser/renderer_host/buffered_resource_handler.cc

 // Copyright (c) 2006-2008 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/renderer_host/buffered_resource_handler.h"
 
 #include "base/histogram.h"
 #include "base/string_util.h"
 #include "net/base/mime_sniffer.h"
 #include "chrome/browser/renderer_host/download_throttling_resource_handler.h"
@@ skipping 246 matching lines @@
                                            in_complete);
     if (bytes_read_) {
       // a Read has already occurred and we need to copy the data into the
       // EventHandler.
       net::IOBuffer* buf = NULL;
       int buf_len = 0;
       download_handler->OnWillRead(request_id, &buf, &buf_len, bytes_read_);
       CHECK((buf_len >= bytes_read_) && (bytes_read_ >= 0));
       memcpy(buf->data(), read_buffer_->data(), bytes_read_);
     }
-    // Update the renderer with the response headers which will cause it to
-    // cancel the request.
-    // TODO(paulg): Send the renderer a response that indicates that the request
-    //              will be handled by an external source (the browser).
+
+    // Send the renderer a response that indicates that the request will be
+    // handled by an external source (the browser's DownloadManager).
     real_handler_->OnResponseStarted(info->request_id, response_);
+    URLRequestStatus status(URLRequestStatus::HANDLED_EXTERNALLY, 0);
+    real_handler_->OnResponseCompleted(info->request_id, status);
+
+    // Ditch the old async handler that talks to the renderer for the new
+    // download handler that talks to the DownloadManager.
     real_handler_ = download_handler;
   }
   return real_handler_->OnResponseStarted(request_id, response_);
 }
 
 bool BufferedResourceHandler::DidBufferEnough(int bytes_read) {
   const int kRequiredLength = 256;
 
   return bytes_read >= kRequiredLength;
 }