[heycam/webidl] Define 'CancelationError'. (#339)

In order to support the 'CancelationController' concept defined in
whatwg/dom#434, this patch specifies a new 'DOMException' named
'CancelationError' in order to ensure that APIs that consume this
new concept have a standard way of responding to its signals.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/339

-- Commit Summary --

  * Define 'CancelationError'.

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/heycam/webidl/pull/339.patch
https://github.com/heycam/webidl/pull/339.diff

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