[ServiceWorker] ExtendableMessageEvent.source cannot be SameObject (#816)

According to [WebIDL] (http://heycam.github.io/webidl/#SameObject), `[SameObject]` doesn't apply to union types, so we should remove this annotation from ExtendableMessageEvent.source.

---
Reply to this email directly or view it on GitHub:
https://github.com/slightlyoff/ServiceWorker/issues/816

Received on Saturday, 9 January 2016 04:07:18 UTC