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

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https://hg.mozilla.org/integration/gaia-central/rev/ac8b988b122a
Author: John Ford <john@johnford.info>
Desc: Revert "Merge pull request #14453 from arroway/bug-945111"

https://bugzilla.mozilla.org/show_bug.cgi?id=945111#c27

This reverts commit c17ce6040081294f8b6b3ed52decd6788da20dce, reversing
changes made to ba2cd3f149cb2e39b8d0449b4e862b036884a248.
Bumping manifests a=b2g-bump