chromium/chrome/test/data/extensions/good2_update_manifest.xml

<?xml version='1.0' encoding='UTF-8'?>
<!--
  This update manifest points to the good2.crx file. It is meant to be used
  with a URLRequestMockHTTPJob, and the hostname must be kept in sync.
-->
<gupdate xmlns='http://www.google.com/update2/response' protocol='2.0'>
  <app appid='ldnnhddmnhbkjipkidpdiheffobcpfmf'>
    <updatecheck codebase='http://update.extension/extensions/good2.crx'
                 version='1.0.0.1' />
   </app>
</gupdate>