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

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https://hg.mozilla.org/integration/gaia-central/rev/959371290e13
Author: Michael Vines <mvines@codeaurora.org>
Desc: Merge pull request #11619 from mvines/bug906890

Bug 906890 - [FTU] Protect against null getDeviceStorage('sdcard'). r=fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/61d9e368ceb9
Author: Michael Vines <mvines@codeaurora.org>
Desc: Bug 906890 - [FTU] Protect against null getDeviceStorage('sdcard')

Change-Id: I159e38415928f2800b728a2ce5822bf6ac45e284