In url_request_unittest.cc, there are several calls to EmbeddedTestServer::AddDefaultHandlers with an argument of base::FilePath(FILE_PATH_LITERAL("net/data/ssl"))). As far as I can tell, these tests are never serving files from the net/data/ssl directory, and these calls are simply to set up the default handlers on the embedded test server.

It looks like all of these calls can be replaced by a call to net::test_server::RegisterDefaultHandlers(EmbeddedTestServer*).