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

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https://hg.mozilla.org/integration/gaia-central/rev/a922bb45313c
Author: Praveen Sridhar <prvn431@gmail.com>
Desc: Bug 930440 - [Messages] Urls in a message are not highlighted when tapping on them r=julien
Bumping manifests a=b2g-bump