[Extensions] Polish the suspicious extension bubble

chrome/app/chromium_strings.grd

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       <message name="IDS_EXTENSIONS_INCOGNITO_WARNING" desc="Warns the user that Chromium cannot prevent extensions from recording history in incognito mode. Displayed in extensions management UI after an extension is selected to be run in incognito mode.">
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         Remove from Chromium...
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+        </message>

[Finnur, 2015/05/15 15:58:47]

You should probably use jshin's new system?
https://codereview.chromium.org/1103293004/

I'm OK with a follow-up patch for that (especially if you plan to merge, I'm not
sure his patch is in the branch).

[Devlin, 2015/05/15 16:12:41]

Oh, nifty - never seen that new system before.  I'll do that in a follow-up next
week. :)  Thanks for pointing it out!

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