[heycam/webidl] Remove unused callback interface functionality (#696)

Fixes #661.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/696

-- Commit Summary --

  * Remove unused callback interface functionality

-- File Changes --

    M index.bs (194)

-- Patch Links --

https://github.com/heycam/webidl/pull/696.patch
https://github.com/heycam/webidl/pull/696.diff

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https://github.com/heycam/webidl/pull/696