title: chrome.management.getAll() not working
body: <p>Im trying to display a list of all installed extensions in my popup.html. When the browser action is clicked, i send a request from popup.js to my background.js, where i want to collect the list of all installed extensions and return them to the popup to be displayed. In my background.js im calling:</p>
  
  <pre><code>var extensionList = chrome.management.getAll();
  </code></pre>
  
  <p>which returns nothing, and have also tried</p>
  
  <pre><code>chrome.management.getAll(function(info) {
      alert(info.length);
  });
  </code></pre>
  
  <p>assuming "info" is the array of installed extensions. None of these are working, could anybody point me in the right direction?</p>
  
  <p>Thanks</p>