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

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https://hg.mozilla.org/integration/gaia-central/rev/345f69046067
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #14641 from cctuan/949966

Bug 949966 - [Gallery] empty message of delete dialog

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https://hg.mozilla.org/integration/gaia-central/rev/dad53410a020
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 949966 - [Gallery] empty message of delete dialog