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chromium/chrome/test/data/downloads/dangerous/download-dangerous.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><title>Test Download Multiple files Infobar.</title>
<script>
function RedirectToDangerous() {
  filename = window.location.search.split("?")[1];
  window.location.href = filename;
}
</script>
</head>

<body onload="RedirectToDangerous();">
<h2>
Should trigger download for an unsafe/dangerous file type.<br>
Filename should be passed as query string.
</h2>

</body>
</html>