Fix directory listing not working for extension background pages with network service.

Bug: 933130
Change-Id: I1658eb98f0dfa7c3f88d37ff581ef3f520a7386a
Reviewed-on: https://chromium-review.googlesource.com/c/1477798
Commit-Queue: John Abd-El-Malek <[email protected]>
Reviewed-by: Ken Rockot <[email protected]>
Cr-Commit-Position: refs/heads/master@{#633457}
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 96b7c0a3..a5ed852d 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -4688,7 +4688,8 @@
       return;
     }
     content::CreateFileURLLoader(request, std::move(loader), std::move(client),
-                                 /*observer=*/nullptr);
+                                 /*observer=*/nullptr,
+                                 /* allow_directory_listing */ true);
   }
 
   void Clone(network::mojom::URLLoaderFactoryRequest loader) override {