ServiceWorker

d2391d45 - Change name from targetClientId to replacesClientId (#1333)

Change name from targetClientId to replacesClientId (#1333) We had decided (and I forgot) to change the name of FetchEvent.targetClientId to .replacesClientId to clarify the meaning that this client is a to-be-replaced client: https://github.com/w3c/ServiceWorker/issues/1091#issuecomment-342569083. Fetch PR: https://github.com/whatwg/fetch/pull/774. HTML PR: https://github.com/whatwg/html/pull/3788. Related issue: https://github.com/w3c/ServiceWorker/issues/1245.