Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/dec120fde808
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 997206 Unxfail test_sms_with_attachments.py a=testonly r=me

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https://hg.mozilla.org/integration/gaia-central/rev/f92d187c7c2c
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 936703 - [async_storage] callback in transaction.oncomplete event. r=djf"

This reverts commit 5c67efc052a276721b5d39ed35118098e75e891a.

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https://hg.mozilla.org/integration/gaia-central/rev/0802cfc3fb83
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18340 from mcav/vibrate-toggle

Bug 918400 - [Clock] Vibrate should use a toggle instead of a drop down. r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/fdbb7263f024
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 918400 - [Clock] Vibrate should use a toggle instead of a drop down.
Bumping manifests a=b2g-bump