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

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https://hg.mozilla.org/integration/gaia-central/rev/fb5b246671f6
Author: Mike Pennisi <mike@mikepennisi.com>
Desc: Revert "Bug 907177 - [Clock] Add integration tests"

This reverts commit 0ea959d81cefa0128157ec3ff0e2b7bdd29afacf.
Bumping manifests a=b2g-bump