[w3c/IndexedDB] Behavior tested by transaction-abort-multiple-metadata-revert.html is not obviously specified anywhere (#109)

Behavior tested by transaction-abort-multiple-metadata-revert.html is not obviously specified anywhere

That's vague and is a mouthful, so let me explain.

This test creates some object stores, and each objectstore has an index.

At one point in the test, it:
1 - Grabs an object store handle.
2 - Deletes the references object store (which has an index)
3 - Verifies that the object store handle's set of index names is empty:
`
        database.deleteObjectStore('not_books');
...
        assert_array_equals(
            store.indexNames, [],
            'IDBObjectStore.indexNames for the deleted store3 should be empty ' +
            'immediately after IDBDatabase.deleteObjectStore() returns');
`
The problem is... I can't find where this behavior is actually specified.

Looking at the steps for IDBDatabase.deleteObjectStore, looking at behavior for "object store handle" or "index set" and other related terms... I can find nothing that states that once an object store is deleted that the object store handles referencing it should have their indexNames set cleared out.

Note: I'm not arguing with the behavior. The behavior might make sense. I see that it could go either way but don't feel strongly about it.

I'm just arguing that the behavior is either:
1 - Not specified
2 - Specified, but in a non-obvious way, and that we should make it more obvious.

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https://github.com/w3c/IndexedDB/issues/109