Bumping gaia.json for 3 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/f2c6443ee65f
Author: mozshiao9 <mshiao@mozilla.com>
Desc: Merge pull request #10482 from mozshiao9/master_camera_881218

Bug 881218 - [Camera] Record of deleted videos are not updated in camera filmstrip, r=@dominickuo

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https://hg.mozilla.org/integration/gaia-central/rev/47a337048b91
Author: Mark Shiao <mshiao@mozilla.com>
Desc: gallery and camera already listening to poster deletion, removing listeners

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https://hg.mozilla.org/integration/gaia-central/rev/ce35bb96f862
Author: Mark Shiao <mshiao@mozilla.com>
Desc: Bug 881218 - [Camera] Record of deleted videos are not updated in camera filmstrip
Bug 885620 - Support FB fallback when HWC is not available, r=vlad