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

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https://hg.mozilla.org/integration/gaia-central/rev/346b072b536e
Author: jyothi.prasad <jyothi.prasad@lge.com>
Desc: Bug 889735 [MMS] when attaching so many images,size of the attached MMS content is not refreshed even after removing some images - r=julienw

* Recalculates size after image resize, and after image removal
* Unit test by gnarf