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

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https://hg.mozilla.org/integration/gaia-central/rev/b0a4e617d7f0
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12242 from crdlc/bug-916690

Bug 916690 - Reduce memory consumption with a lazy load of the dragdrop and wallpaper components

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https://hg.mozilla.org/integration/gaia-central/rev/5344f1cf04ba
Author: crdlc <crdlc@tid.es>
Desc: Bug 916690 - Reduce memory consumption with a lazy load of the dragdrop and wallpaper components