title: what is the alternative of javaScriptWindowObjectCleared() on new qt 5.10 ?javaScriptWindowObjectCleared is not recognized on qt 5.10
body: <p>Please help I want to port webkit to WebEngine but I have some problems with that, I have a signal javaScriptWindowObjectCleared() which is not recognized by new qt 5.10. What can help me in this case?</p>
  
  <pre><code>connect( this-&gt;page(), SIGNAL( javaScriptWindowObjectCleared() ), SLOT( OnPopulateJavaScriptObjec() ) );
  </code></pre>