Re: [IndexedDB] setVersion blocked on uncollected garbage IDBDatabases

I'm actually fine with keeping the setVersion from proceeding until
the old database is collected. First, this is probably a bug in the
web page, and the page should be fixed. Second, the new database that
is waiting for setVersion to proceed will get an onblocked event, so
the page should know that something is wrong.

I really don't think this is that big of a deal, and certainly not
worth changing the opt-in vs. opt-out behavior that we've settled on.

-Ben