[whatwg/dom] Use Infra's concatenation definition (#556)

Fixes #555.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/556

-- Commit Summary --

  * Use Infra's concatenation definition

-- File Changes --

    M dom.bs (28)

-- Patch Links --

https://github.com/whatwg/dom/pull/556.patch
https://github.com/whatwg/dom/pull/556.diff

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