[whatwg/dom] Use Web IDL to construct custom element constructors (#430)

Fixes part of https://github.com/whatwg/html/issues/2381. The other
part is covered by https://github.com/whatwg/html/pull/2457.

Cannot be merged until https://github.com/heycam/webidl/pull/328 is also merged and the cross-spec linking database has been populated.

Tests coming, will edit.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/430

-- Commit Summary --

  * Use Web IDL to construct custom element constructors

-- File Changes --

    M dom.bs (6)

-- Patch Links --

https://github.com/whatwg/dom/pull/430.patch
https://github.com/whatwg/dom/pull/430.diff

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