title: iOS 9 safari iframe src with custom url scheme not working
body: <p>I use this solution <a href="https://gist.github.com/davidwkeith/2662899" rel="nofollow noreferrer">https://gist.github.com/davidwkeith/2662899</a> to redirect from web page into my app if app installed.
  But it doesn't work on iOS 9. It's still working in Google-chrome. But <code>iframe</code> with custom URL scheme can't launch the application from Safari.</p>
  
  <p>If I replace</p>
  
  <pre><code>document.getElementById('loader').src = 'custom-protocol://my-app'
  </code></pre>
  
  <p>(where loader is iframe) with</p>
  
  <pre><code>window.location = 'custom-protocol://my-app'
  </code></pre>
  
  <p>it will work.</p>
  
  <p>os: iOS 9 beta4 and beta5</p>
  
  <p>Anybody knows this problem? Is it iOS 9 beta bug? Or it will not be fixed?</p>