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Summary: If Flow can be trusted, getConstantsForViewManager always gets called with a non-null string: 1. The only call-site to getConstantsForViewManager is getViewManagerConfig: [PaperUIManager.js](https://github.com/facebook/react-native/blob/822bf52c29729d25b2bfb31655cf773609a9283d/packages/react-native/Libraries/ReactNative/PaperUIManager.js#L36-L80) 2. And getViewManagerConfig always passes in a non-null string. So, let's just make the native argument type a non-nullable string. Thoughts? Changelog: [Internal] Reviewed By: sammy-SC Differential Revision: D52628937 fbshipit-source-id: 0ca68b38253cf134af29974af9e36380d66895a1