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

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https://hg.mozilla.org/integration/gaia-central/rev/a80b392a3551
Author: Dale  Harvey <dale@arandomurl.com>
Desc: Merge pull request #8468 from comoyo/remove_mouseeventshim2

Bug 847908 - [Gallery] Remove mouse event shim in favor of GestureDetector. r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/b4cacec9a5ab
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 847908 - [Gallery] Remove mouse event shim in favor of GestureDetector

Author:    Jan Jongboom <janjongboom@gmail.com>