This has been removed from the spec. See: https://github.com/slightlyoff/ServiceWorker/issues/723#issuecomment-123516555
Comment on attachment 8678523 [details] [diff] [review] Remove FetchEvent.client r=me, though I'm trusting you on the waitUntil/matchAll bits in the test code.
Attachment #8678523 - Flags: review?(bzbarsky) → review+
I've marked the client page as deprecated: https://developer.mozilla.org/en-US/docs/Web/API/FetchEvent/client The release notes have this documented too: https://developer.mozilla.org/en-US/Firefox/Releases/44#Service_Workers
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