title: Qtwebengineprocess is not closed after application closing
body: <p>I have an application that uses Qt WebEngine. But I found that after closing my application or after crashing it "Qtwebengineprocess" still stays on. My app is too big to show it here, but here is a little example which also demostrates the problem:</p>
  
  <pre><code>#include &lt;QApplication&gt;
  #include &lt;QWebEngineView&gt;
  #include &lt;QProcess&gt;
  #include &lt;QTimer&gt;
  
  
  int main(int argc, char **argv)
  {
      QApplication app(argc, argv);
      QWebEngineView* viewer = new QWebEngineView(NULL);
      viewer-&gt;show();
      viewer-&gt;load(QUrl("https://www.telegraph.co.uk/content/dam/Pets/spark/royal-canin/tabby-kitten-small.jpg?imwidth=1400"));
      QTimer::singleShot(2000, []() {
          exit(-1);
      });
      app.exec();
      delete viewer;
  
      return 0;
  }
  </code></pre>
  
  <p>Did I forget to set up some thing? Or this is a Qt bug? Thanks in advance.</p>
  
  <p><strong>UPD</strong>: Qt 5.11, Win10</p>