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

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https://hg.mozilla.org/integration/gaia-central/rev/99a07b8780aa
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #12095 from eeejay/bug-914882

Bug 914882 - Style clipped settings panels as invisible. r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/7d4f34845e97
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 914882 - Style clipped settings panels as invisible.