Valentin Shergin b6e42517e5 Fabric: Now EventEmitter::setEnabled() relies on stored eventTarget is not being nullptr
Summary:
This diff implements a new model of managing `enabled` flag in EventEmitter.
Now we simply rely on `eventTarget_` is not being `nullptr` (and we reset the pointer to "disable" the event emitter).

Reviewed By: mdvacca

Differential Revision: D9764857

fbshipit-source-id: 1dd3ce0c8589048babbf2dbac9f8359358b31a34
2018-09-13 23:02:37 -07:00
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