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

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https://hg.mozilla.org/integration/gaia-central/rev/8612eb558328
Author: Dale  Harvey <dale@arandomurl.com>
Desc: Merge pull request #10531 from rexboy7/fix-bug852836

Bug 852836 - Flip front camera preview to correct direction (regression). r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/02e441b35bc3
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 852836 - Flip front camera preview to correct direction