Re: [ServiceWorker] Soft Update and Register can race when setting registration scriptURL (#789)

@matto, does this match the current spec:

> When a register runs, if the newest worker's URL has NOT changed, the job aborts

As far as I can tell the spec says that the check for matching URL should run synchronously when .register() is called.  We also defer it until the job runs, but I have a bug open to fix that.

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https://github.com/slightlyoff/ServiceWorker/issues/789#issuecomment-160772960