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

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https://hg.mozilla.org/integration/gaia-central/rev/610132b9ad9a
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #10957 from cctuan/master-gallery

Bug 893310 - hdpi/xhdpi replacing @1.5x images assets for Gallery app, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/cfcf9b8d3995
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 893310 - hdpi/xhdpi replacing @1.5x images assets for Gallery app