[whatwg/dom] Use a single exception for name validation (#423)

Tests: https://github.com/w3c/web-platform-tests/issues/5161.

Fixes #319.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/423

-- Commit Summary --

  * Use a single exception for name validation

-- File Changes --

    M dom.bs (12)

-- Patch Links --

https://github.com/whatwg/dom/pull/423.patch
https://github.com/whatwg/dom/pull/423.diff

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