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

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https://hg.mozilla.org/integration/gaia-central/rev/2a47854fee8f
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #19041 from punamdahiya/Bug1006919

Bug1006919- [Gallery] Remove work around to generate and pass file backed blob for pick activity in gallery.js r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/3e9a6ff0f788
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug1006919- [Gallery] Remove work around to generate and pass file backed blob for pick activity in gallery.js r=djf
Bumping manifests a=b2g-bump