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

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https://hg.mozilla.org/integration/gaia-central/rev/5476e49adf00
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #19079 from punamdahiya/Bug994529

Bug994529 - [Gallery][Wallpaper] The left upper of interface cannot be d.isplayed for a short time when set picture as wallpaper r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/350bbedbccab
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug994529 - [Gallery][Wallpaper] The left upper of interface cannot be displayed for a short time when set picture as wallpaper
Bumping manifests a=b2g-bump