title: Printing an iframe in electron shows a save dialog instead of a print dialog
body: <p>I have a sample app on the branch: <a href="https://github.com/EricG-Personal/electron_pdfkit_test/tree/feature/with_iframe" rel="nofollow noreferrer">https://github.com/EricG-Personal/electron_pdfkit_test/tree/feature/with_iframe</a></p>
  
  <p>It is a very simple react based app that upon launch, dynamically creates a PDF and loads it into an iframe.</p>
  
  <p>I have an iframe with contains PDF content. I try to print this iframe with:</p>
  
  <pre><code>iframeloaded()
  {
      console.log( "iframe loaded - printing" );
  
      // window.frames[0].focus();
      // window.frames[0].print();
  
      var myWindow = remote.getCurrentWindow();
  
      myWindow.webContents.print();
  }
  </code></pre>
  
  <p>However, a save dialog appears instead of the expected print dialog. </p>
  
  <p>Is there a way I can get the print dialog to appear?</p>
  
  <p>The PDF that is saved does contain the correct content. </p>
  
  <p>I am using the latest version of electron on the latest version of OS X.</p>