title: How to hide "This tab is using your camera or microphone" after call ended
body: <p>I'm using Sinch javascript SDK to build a browser to browser video calling app.  When the video call is ended with a call to <code>call.hangup();</code> in chrome (at least) the red camera icon is still visible with the message "This tab is using your camera or microphone".</p>
  
  <p>How can I hide this warning after the call has ended? Is there a call in the Sinch SDK I should be making, or something in the underlying WebRTC framework?</p>