Remove worker_requirement files
Remove worker_requirement files

Summary:
Changelog:

These are no longer being used by Buck, we can just remove them.

Reviewed By: zigwei

Differential Revision: D26913017

fbshipit-source-id: c75a07b2dc8c337ceef6da275b0046c0ac048ba7

arthuralee/react-native,pandiaraj44/react-native,javache/react-native,myntra/react-native,myntra/react-native,pandiaraj44/react-native,janicduplessis/react-native,myntra/react-native,janicduplessis/react-native,janicduplessis/react-native,pandiaraj44/react-native,arthuralee/react-native,janicduplessis/react-native,arthuralee/react-native,javache/react-native,pandiaraj44/react-native,facebook/react-native,pandiaraj44/react-native,facebook/react-native,arthuralee/react-native,arthuralee/react-native,facebook/react-native,myntra/react-native,javache/react-native,myntra/react-native,facebook/react-native,facebook/react-native,javache/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,javache/react-native,javache/react-native,myntra/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,janicduplessis/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,facebook/react-native,javache/react-native