Bumping gaia.json for 2 gaia-central revision(s)
Truncated some number of revisions since the previous bump.

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https://hg.mozilla.org/integration/gaia-central/rev/84656c4cf486
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #10389 from rexboy7/fix-bug877903

Bug 877903 - Let apps specifying its orientation as landscape open in la...

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https://hg.mozilla.org/integration/gaia-central/rev/062831a3fe8a
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 877903 - Let apps specifying its orientation as landscape open in landscape-primary
             * Open app by real device orientation
             * Refactor setAppSize and rotateTransition to AppWindow