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Not for me. Mac OS X 10.10.1, Chrome 39.0.2171.95. I get the same code even in incognito mode.

Well that's interesting. This may shed light on some of the seemingly conflicting results. On Mac OS X 10.10.1, Chrome 41.0.2264.2 (Canary):

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.

Perhaps you started (2) before (1) finished?

Same here, got same code on OSX 10.9.5 Chrome 39.0.2171.95