title: Chrome extension microphone capture
body: <p>I have a <code>browser_action</code> extension where the user can press <code>start</code> and <code>stop</code> in order to capture some audio input. After the file has been recorded I would like to dump its url in the console. The problem is that I cannot get access to the microphone. This is what I have tried so far:</p>
  
  <p><code>navigator.webkitGetUserMedia</code> - does not work, <code>navigator.webkitGetUserMedia({ audio: true },...);</code> calls the error callback with a MediaDeviceFailedDueToShutdown. I tried looking into that error but I found nothing useful about that. That error is nowhere to be found.</p>
  
  <p>Could you please guide me to the right path? Thank you.</p>