Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3864ad3f145e
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1081808 - [LockScreen] Decouple the fake-notification styles r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/32dc7cfbb941
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "[LockScreen] Decouple the fake-notification styles"

This reverts commit 22c40f05db8f60927bae594ee6cac8e18b6e8c95.

Backout for not having the proper bug number, bug 1081808.
Bumping manifests a=b2g-bump