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

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https://hg.mozilla.org/integration/gaia-central/rev/ffc4fd1b37f0
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #26698 from punamdahiya/Bug1106877

Bug1106877 - [Gallery] - Fix of grey bars and cannot tap in thumbnails for images smaller than thumbnail container r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/e2624551c3ec
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug1106877 - [Gallery] - Fix of grey bars and cannot tap in thumbnails for images smaller than thumbnail container div r=djf
Bumping manifests a=b2g-bump