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

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https://hg.mozilla.org/integration/gaia-central/rev/d6a0f6acfa82
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #22218 from vingtetun/chromebar-additional2

Bug 1044423 - Add more logics to AppChrome.js. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/eeb437204a33
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1044423 - Add more logics to AppChrome.js. r=etienne
Bumping manifests a=b2g-bump