Removing incorrect XXX comments.

suite/browser/nsBrowserContentListener.js

@@ -60,8 +60,6 @@ nsBrowserContentListener.prototype =
         // hook up the whole parent chain thing
         var windowDocShell = this.convertWindowToDocShell(toplevelWindow);
         if (windowDocShell) {
-            // XXXbz this listener is never unregistered.  Did someone neglect 
-            // to read the interface they're using?
             windowDocshell
               .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
               .getInterface(Components.interfaces.nsIURIContentListener)