[whatwg/dom] Un-customify adopted elements (#260)

Fixes https://github.com/whatwg/html/issues/1359.

/cc @dominiccooney
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/260

-- Commit Summary --

  * Un-customify adopted elements

-- File Changes --

    M dom.bs (17)
    M dom.html (11)

-- Patch Links --

https://github.com/whatwg/dom/pull/260.patch
https://github.com/whatwg/dom/pull/260.diff

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