Fabric: Removed leftovers from RCTScheduler
Fabric: Removed leftovers from RCTScheduler

Summary: Trivial. We use `EventBeatFactory`s instead.

Reviewed By: mdvacca

Differential Revision: D9799856

fbshipit-source-id: 67a130161026565ecc948427ffa658837d9bbfc2

hoangpham95/react-native,hammerandchisel/react-native,javache/react-native,myntra/react-native,facebook/react-native,javache/react-native,exponentjs/react-native,hoangpham95/react-native,myntra/react-native,hoangpham95/react-native,pandiaraj44/react-native,janicduplessis/react-native,myntra/react-native,hammerandchisel/react-native,arthuralee/react-native,javache/react-native,exponentjs/react-native,exponentjs/react-native,hammerandchisel/react-native,hammerandchisel/react-native,exponent/react-native,facebook/react-native,pandiaraj44/react-native,hammerandchisel/react-native,javache/react-native,pandiaraj44/react-native,janicduplessis/react-native,pandiaraj44/react-native,javache/react-native,exponent/react-native,myntra/react-native,myntra/react-native,exponentjs/react-native,janicduplessis/react-native,facebook/react-native,exponent/react-native,myntra/react-native,javache/react-native,janicduplessis/react-native,arthuralee/react-native,exponent/react-native,exponent/react-native,facebook/react-native,hoangpham95/react-native,pandiaraj44/react-native,hoangpham95/react-native,exponentjs/react-native,javache/react-native,javache/react-native,exponent/react-native,myntra/react-native,exponentjs/react-native,janicduplessis/react-native,hoangpham95/react-native,arthuralee/react-native,exponent/react-native,facebook/react-native,facebook/react-native,arthuralee/react-native,hammerandchisel/react-native,facebook/react-native,exponentjs/react-native,janicduplessis/react-native,myntra/react-native,hammerandchisel/react-native,facebook/react-native,hoangpham95/react-native,facebook/react-native,arthuralee/react-native,exponentjs/react-native,janicduplessis/react-native,javache/react-native,hammerandchisel/react-native,myntra/react-native,janicduplessis/react-native,exponent/react-native,pandiaraj44/react-native,pandiaraj44/react-native,hoangpham95/react-native,pandiaraj44/react-native