Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a8674008468e
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Revert "[Bug 944026] Make sure installed apps are the native size [r=amirn]"

This reverts commit ea7938ee280423f1b8523661be0c8ccc01f9eeb3.