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

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https://hg.mozilla.org/integration/gaia-central/rev/32bb22b68077
Author: Arthur Chen <crh0716@gmail.com>
Desc: Revert "Bug 961800 - Implement Child Window Factory."

This reverts commit 769a5b332ae1fb7758583006567e05ac8dd42dc1.
Bumping manifests a=b2g-bump