[heycam/webidl] Remove the 'user object' concept. (#662)

Platform objects can be used as callback interfaces in all browsers, so there's
no point in having this distinction.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/662

-- Commit Summary --

  * Remove the 'user object' concept.

-- File Changes --

    M index.bs (110)

-- Patch Links --

https://github.com/heycam/webidl/pull/662.patch
https://github.com/heycam/webidl/pull/662.diff

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