[whatwg/dom] Copy the origin pointer when cloning a document (#380)

Fixes #378.

Tests: https://github.com/w3c/web-platform-tests/issues/4268.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/380

-- Commit Summary --

  * Copy the origin pointer when cloning a document

-- File Changes --

    M dom.bs (7)

-- Patch Links --

https://github.com/whatwg/dom/pull/380.patch
https://github.com/whatwg/dom/pull/380.diff

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