Automatic sign out from Chrome browser on exit?

In a nutshell:  I'd like to configure Chrome on shared computers so that students can log into the browser with their Google accounts, yet have Chrome automatically sign out (disconnect) their Google account when the student exits.

The ugly details...
I need to deploy Google Chrome browser (version 38) into 100+ Windows 7 computer labs in our K-12 schools.  These are shared computers in labs, and are not joined to a domain (I've learned to leverage local group policy).  The students all use a local "student" account to log into Windows.

So I'm building a Windows client group policy object for chrome to provide a common user experience across these computers and prevent students from tampering with the local settings.  The Chromium project provides the required .amdx files (http://www.chromium.org/administrators), and I've gotten the major features configured (proxy configuration, home page settings, popups, safe search, etc.), but I'm not finding any setting to allow students to log into the browser without keeping the account connected.

Having the browser delete cookies and clear cache files on exit doesn't do the trick.  I'm beginning to think that there isn't a way to do what it is that I'm trying to do.  What do you experts think?
bryanhwoodsAsked:
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Joseph MoodyBlogger and wearer of all hats.Commented:
Are you using these for your policy: https://support.google.com/chrome/a/answer/187202?hl=en
Joshua GrantomSenior Systems AdministratorCommented:
Perhaps an extension will help? I agree that Google should add this functionality but for now, try this.


https://chrome.google.com/webstore/detail/auto-logout/ohlcnddhihadnalofegeookbpglgadhe?hl=en
bryanhwoodsAuthor Commented:
Joseph,

I had followed the link on that page to the "Chromium developer site" and downloaded the zip file from there.

Let me check the download that's linked directly from the Google help page and see if they're any different.
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bryanhwoodsAuthor Commented:
Joshua,

That looks like what I'm trying to do...  Typically (but not always), if there's an extension to do something, it's because that functionality isn't otherwise available.

If there's a way to do it without the extension, that would be preferable, but I'll check out this extension and see if it'll work.
bryanhwoodsAuthor Commented:
I've found that Chrome features an "ephemeral mode" that does exactly what I'm looking for:

https://support.google.com/a/answer/3538894?hl=en

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bryanhwoodsAuthor Commented:
As I continued to look further into the matter, I noticed a Chrome policy identified as "ForceEphemeralProfiles" (https://support.google.com/a/answer/3538894?hl=en).  After reading the documentation on this feature and testing it, I determined that forcing my lab computers to use this feature gave me the exact result that I had been seeking.
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