Re: [whatwg/storage] Session storage and changing browsing contexts (#119)

Firefox's storage implementation originally intended to queue storage events but the naive implementation logic for that never actually worked, just temporarily consumed memory as it buffered the events without coalescing, so we removed it in a cleanup.

Defining "pageshow" to mean "welcome to the future! everything has changed! reconsider everything!" is very appealing as an implementer, but if you're going to expose SessionStorage to a pre-rendered page at all, maybe it's better to instead generate synthetic StorageEvent events with the constraint that `oldValue` will not be present.  So for pages that are frozen/etc., they'd just accumulate a list of dirty keys and when they become unfrozen, we fire a bunch of synthetic storage events at them.  This seems friendlier to content and with reasonable memory costs since we're just storing a set of keys.

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