[w3c/IndexedDB] Fixes for databases() (#250)

As mentioned in https://github.com/w3c/IndexedDB/pull/240#pullrequestreview-176123399

* For an opaque origin, `SecurityError` is more consistent. We need a test for this.
* Call out the case where the databases for an origin can't be enumerated.

I also made _for each_ use "of" instead of "in" consistently per [infra](https://infra.spec.whatwg.org/#list-iterate) and linkified a few _set_ and _list_ mentions nearby.

@brettz9 - can you take a peek?


You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/250

-- Commit Summary --

  * Fixes for databases()

-- File Changes --

    M index.bs (53)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/250.patch
https://github.com/w3c/IndexedDB/pull/250.diff

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/IndexedDB/pull/250