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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><title>Test Download Multiple files Infobar.</title>
</head>

<body>
<h2>Loading this page should trigger the multiple downloads infobar.</h2>

<iframe src="download-a_zip_file_frame.html"></iframe>
<iframe src="download-a_zip_file_frame.html"></iframe>

</body>
</html>