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

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https://hg.mozilla.org/integration/gaia-2_1/rev/aace237f3d50
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #26629 from aosmond/bug1078435"

This reverts commit 3919250c8884439a9faaddfa18057d8b8c7f6002, reversing
changes made to 6af3d029bae3a14f400fec0926f0f8ad7b579b4b.
Bumping manifests a=b2g-bump