Re: [heycam/webidl] [Exposed] section unnecessarily restrictive about partial interface + members (#515)

It walks up to the partial <https://heycam.github.io/webidl/#dfn-exposure-set>:

> 3. If C is an interface member, interface mixin member, or namespace member, then:
> [...]
> Otherwise, set C to be the interface, partial interface, interface mixin, partial interface mixin, namespace, or partial namespace C is declared on.

Then the algo retrieves the exposure set of the partial interface and returns it (or walks up to the original non-partial version of the interface and returns the exposure set of *that*).

Per the current algorithm, in your example, `X` is exposed to both `Foo` and `Bar`, while `X.foo` is only exposed to `Bar`.

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