Use the user's preferred downloads directory for creating the initial download file.

content/browser/download/save_package.cc

Index: content/browser/download/save_package.cc
diff --git a/content/browser/download/save_package.cc b/content/browser/download/save_package.cc
index 0ef878efa2581dca506cbbea68a4b196f860784f..f7569c8c097a781860825ad4c6910bf70ea0bdbf 100644
--- a/content/browser/download/save_package.cc
+++ b/content/browser/download/save_package.cc
@@ -1243,7 +1243,8 @@ void SavePackage::GetSaveInfo() {
   DCHECK(download_manager_);
   if (download_manager_->GetDelegate()) {
     download_manager_->GetDelegate()->GetSaveDir(
-        web_contents(), &website_save_dir, &download_save_dir, &skip_dir_check);
+        web_contents()->GetBrowserContext(), &website_save_dir,
+        &download_save_dir, &skip_dir_check);
   }
   std::string mime_type = web_contents()->GetContentsMimeType();
   std::string accept_languages =