Inabox: Change use of includes within whitelist checking to indexOf. #20805
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Apparently Array.prototype.includes is not being polyfilled within the host script. Not that it's beneficial to do so, but I initially assumed that this was the case and it wouldn't make a difference. But since it wasn't, as a result the host script would fail on old browsers (like on Android, where old Chrome versions are still rampant). This changes the use of includes() to the older indexOf() to ensure that it would work there.