Remove long redundant comment about needing to supply a binddn (ex bug 75990) r/sr=dmose over irc.

directory/xpcom/base/src/nsLDAPService.cpp

@@ -764,8 +764,6 @@ nsLDAPService::EstablishConnection(nsLDAPServiceEntry *aEntry,
         return NS_ERROR_FAILURE;
     }
 
-    // Here we need to provide the binddn, see bug #75990
-    //
     rv = conn->Init(host.get(), port, 
                     (options & nsILDAPURL::OPT_SECURE) ? PR_TRUE : PR_FALSE, 
                     binddn, this, nsnull, protocolVersion);