Fabric: Proper way to stop Fabric Surfaces
Fabric: Proper way to stop Fabric Surfaces

Summary:
@public
Apparently, we have to call `ReactFabric.unmountComponentAtNode(tag)` instead of `AppRegistry.unmountApplicationComponentAtRootTag(tag)`.

Reviewed By: sahrens

Differential Revision: D9652730

fbshipit-source-id: f56dba7dbe5421a7d939b91178db5104476fe550

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