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

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https://hg.mozilla.org/integration/gaia-central/rev/a16bfd899489
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #10608 from Cwiiis/master

Bug 817876 - Handle multiple modal dialogs from the same origin r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/0e7d10d4d3dc
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 817876 - Handle multiple modal dialogs from the same origin