Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/77712e7cade0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15224 from KevinGrandon/revert_15223

Bug 952629 - Revert unintentional merge.

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https://hg.mozilla.org/integration/gaia-central/rev/4a3cf47879c7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert unintentional merge.
This reverts commit ce4151d0130481df6364ad5a540a6afeaef00e0b.
This reverts commit dfa9fa8c1802b4cc6835d8af8a745477534c2936.