[heycam/webidl] Add missing legacy error names. (#251)

Fixes: https://www.w3.org/Bugs/Public/show_bug.cgi?id=27732
Fixes: https://wicg.github.io/entries-api/#issue-bfc3b40a
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/251

-- Commit Summary --

  * Add missing legacy error names.

-- File Changes --

    M index.bs (30)
    M index.html (20)

-- Patch Links --

https://github.com/heycam/webidl/pull/251.patch
https://github.com/heycam/webidl/pull/251.diff

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