Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2dce8ae3d194
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Revert "Bug 929027 - [Messages] Multiple image sharing from Gallery to Messages r=schung"

This reverts commit fdc8e4beba5c8279f32083bc4e702348ef22f211.

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https://hg.mozilla.org/integration/gaia-central/rev/230677ee9536
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #16455 from JonHylands/jhylands-947617-clock-power-usage

Bug 947617 - fixed clock hand transform to invoke the GPU. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/b910d53b03da
Author: Jon Hylands <jhylands@mozilla.com>
Desc: Bug 947617 - fixed clock hand transform to invoke the GPU
Bumping manifests a=b2g-bump