Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/9f6691adac69
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 885283 - [sms] receiving a SMS from an existing thread but on a new thread container is broken r=gnarf

* Refactored how threads are added when a new message is received
* This incidentally resolves the bug
* made FixedHeader's refresh and scroll handler so that it's being called once
  per tick only. Then we won't be afraid of calling refresh too many.
* remove some unused code in FixedHeader
* adds tests for FixedHeader
* Fix indentation of createThreadMockup