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

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https://hg.mozilla.org/integration/gaia-central/rev/23f80d7380ba
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Revert "Bug 920752 - Make origin more flexible to fix browser case"

This reverts commit 29ffb50a702bfc61906ee9599a7b41b2b6505d25.