title: VTT(Subtitles) is not working from external url
body: <p>I am trying to play the subtitle of a movie from an external url but it doesn't work and when I try to add vtt file whcih is loacally stored then it works. Below are the codes
  <code>&lt;video id="video" controls preload="metadata"&gt;
     &lt;source src="video/sintel-short.mp4" type="video/mp4"&gt;
     &lt;track label="English" kind="subtitles" srclang="en" src="http://devcache.filmflexmovies.com/Test/Movies/2016/6/28/SDFEATUREMOVIE/Creed ENG.VTT" default&gt;
  &lt;/video&gt;</code>
  Above code doesn't work. But when I copied the content of vtt it works.
  <code>&lt;video id="video" controls preload="metadata"&gt;
     &lt;source src="video/sintel-short.mp4" type="video/mp4"&gt;
     &lt;track label="English" kind="subtitles" srclang="en" src="abc.VTT" default&gt;
  &lt;/video&gt;</code>
  Please help.</p>