/**
  * Removes <tt>WebRtcDataStreamListener</tt> from the list of listeners.
  *
  * @param listener the <tt>WebRtcDataStreamListener</tt> to be removed from the listeners list.
  */
 public void removeChannelListener(WebRtcDataStreamListener listener) {
   if (listener != null) {
     synchronized (listeners) {
       listeners.remove(listener);
     }
   }
 }
  /**
   * Expires a specific <tt>Content</tt> of this <tt>Conference</tt> (i.e. if the specified
   * <tt>content</tt> is not in the list of <tt>Content</tt>s of this <tt>Conference</tt>, does
   * nothing).
   *
   * @param content the <tt>Content</tt> to be expired by this <tt>Conference</tt>
   */
  public void expireContent(Content content) {
    boolean expireContent;

    synchronized (contents) {
      if (contents.contains(content)) {
        contents.remove(content);
        expireContent = true;
      } else expireContent = false;
    }
    if (expireContent) content.expire();
  }