[Merge M50] [Downloads] Retain a BlobDataHandle in DownloadUrlParameters.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index da012a1c64c62c784e2b722d962a8f9cc9d2c3a4..43dcd683a842d44b9a50143f28c8470a258fb698 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -798,7 +798,8 @@ DownloadInterruptReason ResourceDispatcherHostImpl::BeginDownload(
   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(