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

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https://hg.mozilla.org/integration/gaia-central/rev/da456a9c8d34
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #11982 from alivedise/bugzilla/913345/virtualize-homescreen-origin

Bug 913345 - Virtualize homescreen origin, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/d0e2c4cf2a94
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 913345 - Virtualize homescreen origin