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

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https://hg.mozilla.org/integration/gaia-central/rev/c89138fb9550
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #20033 from eeejay/bug-1020605"

This reverts commit 763b7f62805570b1606b8738075318020af3fa7d, reversing
changes made to e794eeb8dcb308cd7b1580717ef38e2880987634.
Bumping manifests a=b2g-bump