Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/58d7e79ed8ff
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #19264 from luke-chang/1002358_stingray_app_list

Bug 1002358 - [Stingray] App List Implementation, r=johnhu, r=gchen

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https://hg.mozilla.org/integration/gaia-central/rev/44a6322e3083
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1002358 - [Stingray] App List Implementation

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https://hg.mozilla.org/integration/gaia-central/rev/492f07b06beb
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #19250 from wilsonpage/1003348

Bug 1003348 - [camera] confirmation text not needed for grid lines setting

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https://hg.mozilla.org/integration/gaia-central/rev/b75b6bbcd96f
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1003348 - [camera] confirmation text not needed for grid lines setting
Bumping manifests a=b2g-bump