[heycam/webidl] Remove legacy callers (#412)

Turns out there is only one interface in the Platform using legacy callers (`HTMLAllCollection`). Define the exotic behaviors there instead. PR for that is pending.

Fixes #407.
Fixes #408.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/412

-- Commit Summary --

  * Remove legacy callers

-- File Changes --

    M index.bs (128)

-- Patch Links --

https://github.com/heycam/webidl/pull/412.patch
https://github.com/heycam/webidl/pull/412.diff

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