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chromium/chrome/test/data/ssl/redirect_with_mixed_content.html 

<html>
<head>
  <title>Page that displays insecure content</title>
  <script>
  function ImageWidth() {
    return document.getElementById("bad_image").width;
  }
  </script>
</head>
<body>
  This page contains an image which is served over an http connection,
  causing insecure content (when this page is loaded over https).<br>
  <img id="bad_image" src="http://does-not-exist.test/ssl/google_files/logo.gif" />
<script>window.location.replace(window.location.search.substring(1));</script>
</body>
</html>