Summary: We always define these globals in InitializeJavaScriptAppEngine, so the fallback mechanism here is never required as far as I can tell.
Reviewed By: davidaurelio
Differential Revision: D3235061
fb-gh-sync-id: 92007f87c84073e32bfa946df8ee81083f6842ec
fbshipit-source-id: 92007f87c84073e32bfa946df8ee81083f6842ec