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

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https://hg.mozilla.org/integration/gaia-central/rev/1f9ccf497892
Author: na-matsumoto <na-matsumoto@kddi-tech.com>
Desc: Bug 982029 - [MMS/SMS] Display email in SMS/MMS Threads r=julien
Bumping manifests a=b2g-bump