[heycam/webidl] Prevent [[SetPrototypeOf]] on all globals (#209)

HTML already prohibits it for WindowProxy; see https://html.spec.whatwg.org/multipage/browsers.html#windowproxy. However, this does not cover the other globals, which need to have their prototype chain locked down. See #133 for previous work.

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

  https://github.com/heycam/webidl/pull/209

-- Commit Summary --

  * Remove trailing whitespace
  * Prevent [[SetPrototypeOf]] on all globals

-- File Changes --

    M index.bs (139)
    M index.html (267)

-- Patch Links --

https://github.com/heycam/webidl/pull/209.patch
https://github.com/heycam/webidl/pull/209.diff

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