It doesn't look like net::URLRequestFileJob does an access check or handles that condition. However, net::FileProtocolHandler delegates an access check to net::NetworkDelegate (via OnCanAccessFile), and it looks like that can be used to fail the load.
It doesn't look like net::URLRequest FileJob does an access check or handles that condition. However, net::FileProtoc olHandler delegates an access check to net::NetworkDel egate (via OnCanAccessFile), and it looks like that can be used to fail the load.
I'll give it a try