[Downloads] Retain a BlobDataHandle in DownloadUrlParameters.

content/browser/loader/resource_dispatcher_host_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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <stddef.h>
 #include <algorithm>
@@ skipping 774 matching lines @@
              << url.possibly_invalid_spec();
     return DOWNLOAD_INTERRUPT_REASON_NETWORK_INVALID_REQUEST;
   }
 
   ResourceRequestInfoImpl* extra_info =
       CreateRequestInfo(child_id, render_view_route_id,
                         render_frame_route_id, true, context);
   extra_info->set_do_not_prompt_for_login(do_not_prompt_for_login);
   extra_info->AssociateWithRequest(request.get());  // Request takes ownership.
 
-  if (request->url().SchemeIs(url::kBlobScheme)) {
+  if (request->url().SchemeIs(url::kBlobScheme) &&
+      !storage::BlobProtocolHandler::GetRequestBlobDataHandle(request.get())) {
     ChromeBlobStorageContext* blob_context =
         GetChromeBlobStorageContextForResourceContext(context);
     storage::BlobProtocolHandler::SetRequestedBlobDataHandle(
         request.get(),
         blob_context->context()->GetBlobDataFromPublicURL(request->url()));
   }
 
   // From this point forward, the |DownloadResourceHandler| is responsible for
   // |started_callback|.
   scoped_ptr<ResourceHandler> handler(CreateResourceHandlerForDownload(
@@ skipping 1879 matching lines @@
   ssl.cert_id = GetCertStore()->StoreCert(ssl_info.cert.get(), child_id);
   response->head.security_info = SerializeSecurityInfo(ssl);
 }
 
 CertStore* ResourceDispatcherHostImpl::GetCertStore() {
   return cert_store_for_testing_ ? cert_store_for_testing_
                                  : CertStore::GetInstance();
 }
 
 }  // namespace content