title: How to remove blacklist tag for extension?
body: <p>I have .crx file for my chrome extension and modify external_extensions.json to install it.</p>
  
  <p>It works correctly but after remove it in UI, there is no way to reinstall it.</p>
  
  <p>According to <a href="http://code.google.com/chrome/extensions/external_extensions.html">Google documentation</a>.</p>
  
  <p>If I uninstall extension through the UI, extension is blacklisted and </p>
  
  <p>I can remove it by install the extension through the UI and uninstall it.</p>
  
  <p>What I wan to know is the way to remove blacklist tag without installing through UI.</p>
  
  <p>Is there any way I can use?</p>