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

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https://hg.mozilla.org/integration/gaia-central/rev/b7e1a02be1b6
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #19770 from tauzen/Bug1017572"

This reverts commit e794eeb8dcb308cd7b1580717ef38e2880987634, reversing
changes made to f6b5f77d47d103c672be388082f04709ccdf7f08.
Bumping manifests a=b2g-bump