VirtualizedList update parentProps.getItemLayout flow type
VirtualizedList update parentProps.getItemLayout flow type

Summary:
This is a tighter type that matches the actual prop as defined on line 100

Changelog:
[Internal]

Reviewed By: lunaleaps

Differential Revision: D17863133

fbshipit-source-id: 97f966ff13aa2ce36ef936a9a154fdd137191c6b

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