Steps:
1. Open browser, open [1] in new tab. Get code X.
2. Open [1] in new incognito window. Get code Y.
3. Reload that incognito window. Get code Y.
4. Close incognito window.
5. Open [1] in second new incognito window. Get code X.
Subsequent iterations of opening/closing regular and incognito windows and/or restarting Chrome all yielded code X.
[1] http://www.radicalresearch.co.uk/lab/hstssupercookies/