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

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https://hg.mozilla.org/integration/gaia-central/rev/8e10ff5b0581
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #15122 from staktrace/enable

Bug 909877 - Enable APZ for all of gaia. rs=milan

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https://hg.mozilla.org/integration/gaia-central/rev/027e19147175
Author: Kartikaya Gupta <kgupta@mozilla.com>
Desc: Bug 909877 - Enable APZ for all of gaia. rs=milan