Re: [w3c/push-api] PushSubscriptionOptions ArrayBuffer lifetime issues (#198)

The `serviceWorkerRegistration.pushManager.subscribe(...)` and `getSubscription()` promises are always resolved with a new `PushSubscription` object containing a snapshot of the subscription at that point in time. This in turn owns a `[SameObject] readonly attribute PushSubscriptionOptions options`.

Since `PushSubscription` objects are thus somewhat ephemeral, it actually seems pretty reasonable to allow the author to mutate the `applicationServerKey` or post it to a worker without copying.

Thanks all - I'll send out a PR to replace `[Throws]` with `[SameObject]`.

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