Here's something I don't understand about Chrome, about cookies, or about the relevant standards.
I open a fresh Chrome (31.0.1650.63 m on Windows 7), no previously kept tabs ("Continue where I left off" is off), no cookies.
I open an incognito window, and go to a site S which sets a cookie X, as shown on the 'Resources' tab of Chrome's DevTools.
Now I open a new incognito tab 2, and close the original incognito tab 1. (In other words, I make sure that I keep at least one incognito tab open all the time.)
Then I use "Clear Browsing Data" to clear everything including cookies, from the beginning of time.
In incognito tab 2, I go to the same site S. The 'Network' tab of DevTools shows me that the first request sends cookie X. This seems incorrect to me, since cookie X should have been deleted when I did "Clear Browsing Data".
(It seems like "Clear Browsing Data" is running off of a non-incognito tab, and that it therefore cannot access the cookies of incognito tabs. Or something like that.)
Is this a Chrome bug? If so, is it already reported somewhere? (Update: An answer pointed me to Chromium issue 55945, and then I also found 136180. That last one is reported by a Chromium project member who says, "Having "clear browsing data" clear both the normal and incognito profiles would be an easy fix.") If not, can anyone point me to the relevant documentation or standards?