change flow union type in NativeUIManager.js to any
change flow union type in NativeUIManager.js to any

Summary: Union type is not supported by codegen and doen not have any impact on generated cpp code so I feel we may get rid of this only one case in favor of any.

Reviewed By: TheSavior

Differential Revision: D16283000

fbshipit-source-id: 210a8fbb7c191031e887d66e28dca048006ce00f

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