[w3c/FileAPI] Clarify Lifetime of BlobStore (#89)

I wrote up [an example](https://jsbin.com/yomodiz/1/edit?js,console) trying to figure out how long browsers allow you to load from a given Realm's BlobStore.

It creates a new URL inside of an `<iframe>` and then removes the `<iframe>` from the DOM and tries to use that URL to load a 2nd `<iframe>`.

The behavior seems to be inconsistent:

|Browser|Version|Fires 2nd `<iframe>`'s `onload`|Fires 2nd `<iframe>`'s `onerror`|
|----|----|----|----|
|Safari|11|No|No|
|Firefox|52|No|Yes|
|Chrome|61|Yes|No|

I think the spec is a bit iffy on timeline of when URLs become unavailable for load.

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