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Update new gallery HEAD commit (#60504)

The gallery repository history has been rewritten (see flutter/gallery#87), so updating to HEAD commit
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Pierre-Louis committed
49cf97c35b7b5cfc7dbd87116dc276bd00f4984d
Parent: 2962912
Committed by GitHub <noreply@github.com> on 6/29/2020, 8:49:29 AM