Deprecate SharedShadowNode in favor of ShadowNode::Shared
Deprecate SharedShadowNode in favor of ShadowNode::Shared

Summary:
We are deprecating SharedShadowNode in favor of ShadowNode::Shared, the previous diff already removed most of the usages of SharedShadowNode

changelog: [internal]

Reviewed By: shergin

Differential Revision: D19217718

fbshipit-source-id: 1b7cd1af0ecdc6112befdc45c1dd0fca5012ab21

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