Re: [w3c/ServiceWorker] should clients.claim() control reserved Clients? (#1090)

The "corner case" scenario that I brought in the OP is:
A registration R has both the active worker SW1 and the waiting worker SW2, and the instruction sequence occur as follows.
1. The reserved client gets a controller SW1 through [Handle Fetch](https://w3c.github.io/ServiceWorker/#handle-fetch) step 14.6, and SW1 is serving the fetch event for the reserved client's main resource.
1. SW2 executes `skipWaiting()` so SW2 becomes the active worker and SW1 gets to redundant state.
1. SW2 executes `claim()`.

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