[webkit-dev] PageGroups (and the localStorage being stored in it)

[Jeremy Orlow]

I'm continuing to work on https://bugs.webkit.org/show_bug.cgi?id=25376 and
noticed that the map of origins to localStorageAreas is owned by the
PageGroup class.  I'm having a bit of trouble understanding what exactly
page groups are used for.
I looked through the code and the wiki but couldn't find any explanations.
 I did find
http://lists.macosforge.org/pipermail/webkit-dev/2008-November/005642.html
which
was pretty helpful, but it still doesn't make it clear to me why the
localStorage map needs to reside here (rather than being some
global/singleton object).

Thanks!
Jeremy
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