Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/aec8d43bd45b
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11513 from pivanov/bug-904017

Bug 904017 - [HD]Add New Icon is blurry compared to other icons r=samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/b16f378c35c0
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 904017 - [HD]Add New Icon is blurry compared to other icons