Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/cdd6a45a3c2a
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 1018470 - [ringtones] show spinner for save activity

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https://hg.mozilla.org/integration/gaia-2_0/rev/81d9e21d9199
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #20835 from 6a68/revert-bug-1023419-v2.0

Revert "Bug 1023419 - Unify strings in Firefox Accounts and Find my devi...

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https://hg.mozilla.org/integration/gaia-2_0/rev/ab6ebef4d71f
Author: Jared Hirsch <ohai@6a68.net>
Desc: Revert "Bug 1023419 - Unify strings in Firefox Accounts and Find my device. r=ggp"

This reverts commit 2f77e2686dcd3964498eaca68b244dc6df8c7bf2.
Bumping manifests a=b2g-bump