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

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https://hg.mozilla.org/integration/gaia-central/rev/16c85e438f47
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #12563 from EverythingMe/queryindex-twitter-921841

Bug 921841 - [e.me] Apps installed from Market are not added to Smart Co...

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https://hg.mozilla.org/integration/gaia-central/rev/2528c7498ba8
Author: Amir Nissim <amirn@everything.me>
Desc: Bug 921841 - [e.me] Apps installed from Market are not added to Smart Collections [r=ranbena]