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

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https://hg.mozilla.org/integration/gaia-central/rev/ae0b8ec678bb
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13642 from soumyakanti/Bug_937004

Bug 937004 - Remove Keyboard Layouts section from Developer > Keyboard Layouts r=crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/9f15225a2ae0
Author: Soumya Kanti Chakraborty <soumyakanti.chakraborty@gmail.com>
Desc: Bug 937004 - Remove Keyboard Layouts section from Developer > Keyboard Layouts