Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/09d19920c1c4
Author: sasikala.paruchuri <sasikala.paruchuri@lge.com>
Desc: Bug 929027 - [Messages] Multiple image sharing from Gallery to Messages r=schung

Updated review comments
Bumping manifests a=b2g-bump