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

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https://hg.mozilla.org/integration/gaia-central/rev/7bd9269b911c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #26721 from ochameau/customOrigin2"

This reverts commit 2b696f097884262a1dbffe1b031ad7646f8fc8b3, reversing
changes made to 3ce331dc5b362125c1a6e67ed599407b1d1ea658.
Bumping manifests a=b2g-bump