void ChromeDownloadManagerDelegate::Observe(
    int type,
    const content::NotificationSource& source,
    const content::NotificationDetails& details) {
  DCHECK(type == chrome::NOTIFICATION_CRX_INSTALLER_DONE);

  registrar_.Remove(this,
                    chrome::NOTIFICATION_CRX_INSTALLER_DONE,
                    source);

  scoped_refptr<extensions::CrxInstaller> installer =
      content::Source<extensions::CrxInstaller>(source).ptr();
  content::DownloadOpenDelayedCallback callback = crx_installers_[installer];
  crx_installers_.erase(installer.get());
  callback.Run(installer->did_handle_successfully());
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.