[heycam/webidl] Remove [LegacyArrayClass] (#551)

Nothing in the web platform uses it anymore.

Fixes #291.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/551

-- Commit Summary --

  * Remove [LegacyArrayClass]

-- File Changes --

    M index.bs (98)

-- Patch Links --

https://github.com/heycam/webidl/pull/551.patch
https://github.com/heycam/webidl/pull/551.diff

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