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

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https://hg.mozilla.org/integration/gaia-central/rev/a39211f0a54f
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #15280 from rsajdok/909201

Bug 909201: Editing names doesn't update properly. r=bkelly

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https://hg.mozilla.org/integration/gaia-central/rev/e8823b3b1300
Author: Robert Sajdok <robert.sajdok@gmail.com>
Desc: Bug 909201: Editing names doesn't update properly.
Bumping manifests a=b2g-bump