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

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https://hg.mozilla.org/integration/gaia-central/rev/1b79348b65bf
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #12422 from rexboy7/fix-bug907041

Bug 907041 - Ensure poweroff animation in portrait-primary

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https://hg.mozilla.org/integration/gaia-central/rev/82baec8ec30b
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 907041 - Ensure poweroff animation in portrait-primary