Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/85f28b8bda9c
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #10907 from huchengtw-moz/video/Bug_890139

Bug 890139 - hdpi/xhdpi missing images for Video app, r=@rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/1671339332f1
Author: John Hu <johu@mozilla.com>
Desc: Bug 890139 - hdpi/xhdpi missing images for Video app

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https://hg.mozilla.org/integration/gaia-central/rev/2c8b26149597
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #10911 from mpizza/Bug_881138_hd_camera_master

Bug 881138 - @1.5x images for Camera app, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/e362807898d3
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 881138 - hdpi/xhdpi resolution assets and layout for Camera app