[w3c/ServiceWorker] Remove redundant origin check in unregister algorithm (PR #1818)

This removes the first step of the Unregister algorithm, which threw a "SecurityError" DOMException if the origin of the job's scope URL did not match the job's client's origin.

This check is redundant because the scope URL is derived directly from the ServiceWorkerRegistration object itself. For this check to fail, the ServiceWorkerRegistration would have had to be exposed in a cross-origin client context, which is already prevented by the platform.

Fixes #1305


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  https://github.com/w3c/ServiceWorker/pull/1818

-- Commit Summary --

  * Remove redundant origin check in unregister algorithm

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1818.patch
https://github.com/w3c/ServiceWorker/pull/1818.diff

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