Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/31e041c41372
Author: Julien Wajsberg <felash@gmail.com>
Desc: Revert "Merge pull request #12267 from pivanov/bug-908241"

This reverts commit 400d5fec2f099397575ded3ef8544150a9b472c5, reversing
changes made to a894561828a3a00ea54fe69fad26f0cadf6239fa.