Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/ffd44471fdef
Author: gitmai <mri@tid.es>
Desc: Merge pull request #17586 from gitmai/bug-987761-jshint-fix-followup-965512

Bug 987761 - Folloup up toBug 965512 - [CostControl] jshint fixes
r=jmcf

========

https://hg.mozilla.org/integration/gaia-central/rev/bfb9fe686b5d
Author: mai <mri@tid.es>
Desc: Bug 987761 - Folloup up toBug 965512 - [CostControl] jshint fixes
Bumping manifests a=b2g-bump