No longer use an had hoc auto-close mode for frames opened by
document.write, rely on explicit close() instead.

-matches MSIE/Firefox : unclosed iframe keep owner document in loading
 state for as long as explicit close() hasn't been called.
.matches HTML5 draft for load event emission,
  cf. events/iframe_onload2.html

svn path=/trunk/KDE/kdelibs/; revision=1097846