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chromium/chrome/test/data/navigation_interception/iframe_with_external_navigation.html 

<!DOCTYPE html>
<html>
<!--

Copyright 2016 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.

-->
<head>
  <script>
    function startRedirect() {
      setTimeout(function(){
        window.location.href="market://com.test.blah";
      }, 10);
    };
  </script>
</head>
<body onload='startRedirect();'>
  Hello!!
</body>
</html>