It's going to be removed from Chromium, see https://crbug.com/812523.

/cc @electron/code-owners 
chromium_src/chrome/browser/certificate_manager_model.cc
content::ResourceContext* context,
    base::OnceCallback<void(net::NSSCertDatabase*)> callback) {
  
  
  CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
  if (!g_nss_cert_database) {
    
    
    
    g_nss_cert_database = new net::NSSCertDatabase(
        crypto::ScopedPK11Slot(PK11_GetInternalKeySlot()) ,
        crypto::ScopedPK11Slot(PK11_GetInternalKeySlot()) );
  }
  return g_nss_cert_database;
}
}  
void CertificateManagerModel::Create(content::BrowserContext* browser_context,