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

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https://hg.mozilla.org/integration/gaia-central/rev/a391d9b3c4c3
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #10994 from alivedise/bugzilla/894230/apploadtime-event-listener-target-wrong

Bug 894230 - Use iframe as target of appopen event instead of frame, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/ced34e12bfa3
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 894230 - Use iframe as target of appopen event instead of frame