Mehdi Mulani 81c33b542d Switch out DISABLE_YELLOW_BOX for IS_TESTING
Summary: Switch to using IS_TESTING on the Platform module. While IS_TESTING has to be explicitly set in the test harness, this makes it more usable and stops people from relying on brittle variables in the (larger) environment.

Reviewed By: fkgozali

Differential Revision: D4423661

fbshipit-source-id: 27a80867778b9374bcba67b69f9c93d32c0a74b0
2017-01-18 12:28:42 -08:00
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