Re: [w3c/ServiceWorker] The return value for update() is wrong in WebIDL (#1472)

yoshisatoyanagisawa left a comment (w3c/ServiceWorker#1472)

Let me check what is written in WebIDLs.
Chromium: 
> `[CallWith=ScriptState, RaisesException] Promise<ServiceWorkerRegistration> update();`

(https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/service_worker/service_worker_registration.idl;l=26;drc=047c7dc4ee1ce908d7fea38ca063fa2f80f92c77)

Gecko:
>  ` [Throws, NewObject]`
>  `Promise<undefined> update();`

(https://github.com/mozilla/gecko-dev/blob/fefa0c86cf24e6afa9f4dbb3823d4d16b2713dc7/dom/webidl/ServiceWorkerRegistration.webidl#L28)

WebKit:
>  `[NewObject] Promise<undefined> update();`

(https://github.com/WebKit/WebKit/blob/f8eb4cf035d529c6e55ebfd28c92fdc9468981d5/Source/WebCore/workers/service/ServiceWorkerRegistration.idl#L46)

As @saschanaz pointed out, Gecko and WebKit returns `Promise<undefined>`.
However, although the WebIDL looks invalid, Chromium seems to follow the step by step description in [Resolve Job Promise algorithm](https://w3c.github.io/ServiceWorker/#resolve-job-promise-algorithm).

If mismatch of WebIDL and [Resolve Job Promise algorithm](https://w3c.github.io/ServiceWorker/#resolve-job-promise-algorithm) matters, adjusting the WebIDL can be a choice.  What do you think?

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