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

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https://hg.mozilla.org/integration/gaia-central/rev/8835b9820e5c
Author: Julien Wajsberg <felash@gmail.com>
Desc: Revert "Merge pull request #16347 from steveck-chung/bug-972245"

This reverts commit 7b37543888457b6cdf8cb8dc766bcd6fd3ba383f, reversing
changes made to 98b095fd4ea10ae180bf00925135be0a15b2c7b8.
Bumping manifests a=b2g-bump