Add a test page for Bug 1331351

1331351.html

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+<h1>Test page for <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1331351">Bug 1331351</a></h1>
+<p><a href="data:text/html,<h1>data: URI page</h1><p>This page is contained entirely within the URL.</p>">Navigate to a data: URI</a></p>

index.html

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+<ul>
+<li><a href="1331351.html">Test page for Bug 1331351</a></li>
+</ul>
+
+<hr>
+<p>The code behind these pages is on <a href="https://github.com/mozilla/domsecurity-test">GitHub</a>.</p>