remove "prepareReact" call from the iOS bridge
remove "prepareReact" call from the iOS bridge

Reviewed By: alexeylang

Differential Revision: D6581907

fbshipit-source-id: ca4bd4beef6d75305133a2b2c7de62e65e5aa3da

javache/react-native,pandiaraj44/react-native,exponentjs/react-native,hoastoolshop/react-native,dikaiosune/react-native,exponent/react-native,javache/react-native,hammerandchisel/react-native,jevakallio/react-native,exponent/react-native,hoangpham95/react-native,facebook/react-native,hoangpham95/react-native,dikaiosune/react-native,javache/react-native,ptmt/react-native-macos,ptmt/react-native-macos,exponent/react-native,dikaiosune/react-native,jevakallio/react-native,javache/react-native,pandiaraj44/react-native,ptmt/react-native-macos,facebook/react-native,javache/react-native,facebook/react-native,dikaiosune/react-native,facebook/react-native,ptmt/react-native-macos,exponent/react-native,myntra/react-native,janicduplessis/react-native,dikaiosune/react-native,exponent/react-native,myntra/react-native,javache/react-native,hoastoolshop/react-native,hammerandchisel/react-native,arthuralee/react-native,exponent/react-native,javache/react-native,jevakallio/react-native,arthuralee/react-native,exponent/react-native,ptmt/react-native-macos,janicduplessis/react-native,exponentjs/react-native,jevakallio/react-native,javache/react-native,hoastoolshop/react-native,myntra/react-native,exponentjs/react-native,arthuralee/react-native,hoangpham95/react-native,jevakallio/react-native,dikaiosune/react-native,myntra/react-native,hoastoolshop/react-native,janicduplessis/react-native,hammerandchisel/react-native,hoastoolshop/react-native,hammerandchisel/react-native,pandiaraj44/react-native,facebook/react-native,dikaiosune/react-native,jevakallio/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,facebook/react-native,exponentjs/react-native,ptmt/react-native-macos,hoangpham95/react-native,pandiaraj44/react-native,exponentjs/react-native,exponent/react-native,jevakallio/react-native,arthuralee/react-native,facebook/react-native,hoastoolshop/react-native,jevakallio/react-native,hoangpham95/react-native,exponentjs/react-native,janicduplessis/react-native,hoastoolshop/react-native,janicduplessis/react-native,pandiaraj44/react-native,ptmt/react-native-macos,janicduplessis/react-native,hammerandchisel/react-native,hoangpham95/react-native,hammerandchisel/react-native,jevakallio/react-native,exponentjs/react-native,hoangpham95/react-native,facebook/react-native,hoangpham95/react-native,ptmt/react-native-macos,arthuralee/react-native,hammerandchisel/react-native,janicduplessis/react-native,janicduplessis/react-native,myntra/react-native,exponentjs/react-native,facebook/react-native,pandiaraj44/react-native,javache/react-native,dikaiosune/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,hammerandchisel/react-native,hoastoolshop/react-native