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

========

https://hg.mozilla.org/integration/gaia-central/rev/17c49bd866e1
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 942307 - Escape and newline custom browser prompts. r=fabrice
Bumping manifests a=b2g-bump