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

========

https://hg.mozilla.org/integration/gaia-central/rev/aa7f15ed1163
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1022859 - Follow up jshint comment patch for build/l10n.js
Bumping manifests a=b2g-bump