Make RCTDevSettings conform to RCTBundleHolderModule
Make RCTDevSettings conform to RCTBundleHolderModule

Summary:
Changelog: [Internal]

This diff allows `RCTDevSettings` to access bundleURL directly instead of relying on the bridge.

Reviewed By: RSNara

Differential Revision: D26289592

fbshipit-source-id: e22e583e51323bfe66f6e424d9f47edf71b1ed9f

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