Valentin Shergin 93dd790cad Fabric: Simplified relationship between RawEvent and EventEmitter
Summary: Instead of relying on explicit `RawEventDispatchable` function, we simply check the existence of the `weak_ptr` to `EventTarget`. This is efficient and sufficient because only an EventEmitter retains an associated EventTarget.

Reviewed By: mdvacca

Differential Revision: D9764858

fbshipit-source-id: 4ac25d925f189d0f8b9002e52388fd51629934a8
2018-09-13 23:02:37 -07:00
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