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

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https://hg.mozilla.org/integration/gaia-central/rev/dee99c95aa2d
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #24436 from wilsonpage/1068536

Bug 1068536 - [camera] slide to open camera, camera preview screen is black

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https://hg.mozilla.org/integration/gaia-central/rev/ad27699197ed
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1068536 - [camera] slide to open camera, camera preview screen is black
Bumping manifests a=b2g-bump