Make the download's response headers available in the DownloadItem

content/browser/download/download_create_info.h

Index: content/browser/download/download_create_info.h
diff --git a/content/browser/download/download_create_info.h b/content/browser/download/download_create_info.h
index 59c51ca618cba2026948ea4fb061e66851739b0d..c0ac5b4f68b9692f31c57e500218e256d601c57d 100644
--- a/content/browser/download/download_create_info.h
+++ b/content/browser/download/download_create_info.h
@@ -78,6 +78,10 @@ struct CONTENT_EXPORT DownloadCreateInfo {
 
   base::Optional<ui::PageTransition> transition_type;
 
+  // The HTTP response code. This is 0 when the response has not yet been
+  // received or if the response code text could not be parsed.
+  int response_code;
+
   // The remote IP address where the download was fetched from.  Copied from
   // UrlRequest::GetSocketAddress().
   std::string remote_address;