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

========

https://hg.mozilla.org/integration/gaia-central/rev/e03c317f861e
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #12224 from eeejay/bug-916268

Bug 916268 - Remove special screen reader case in light of lockscreen redesign, r=timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/4f860b8bb75f
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 916268 - Remove special screen reader case in light of lockscreen redesign.