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

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https://hg.mozilla.org/integration/gaia-central/rev/1ff2bfaa9a51
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #11198 from cctuan/898701

Bug 898701 - [Gallery] image in thumbnails display not correctly

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https://hg.mozilla.org/integration/gaia-central/rev/008f10dbc951
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 898701 - [Gallery] image in thumbnails display not correctly