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

========

https://hg.mozilla.org/integration/gaia-central/rev/7362250f9163
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #12690 from cctuan/923918

Bug 923918 - upload icons

========

https://hg.mozilla.org/integration/gaia-central/rev/c3dd89b11da2
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 923918 - upload icons