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

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https://hg.mozilla.org/integration/gaia-central/rev/444503869c6e
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #16530 from mcav/clock-rot

Bug 947617 - Clock app consuming too much power. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/62bc829870f9
Author: Jon Hylands <jhylands@mozilla.com>
Desc: Bug 947617 - Clock app consuming too much power. r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/0c5f7620def0
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 970377 - [Messages][Drafts] Drafts are kept forever r=julienw

https://bugzilla.mozilla.org/show_bug.cgi?id=970377

- Call Drafts.store() when deleting a just sent draft message
- Fix leaky sinon spy

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Bumping manifests a=b2g-bump