[w3c/ServiceWorker] Merge ServiceWorkerMessageEvent into MessageEvent (#990)

Otherwise changes such as https://github.com/whatwg/html/commit/df2c0c448612d5b8ab85ad3c6ce0255ee11c0b01 get them out-of-sync. Rationale for not doing this in https://www.w3.org/Bugs/Public/show_bug.cgi?id=28199 wasn't really compelling or correct.

@cdumez

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Received on Tuesday, 11 October 2016 11:52:25 UTC