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

========

https://hg.mozilla.org/integration/gaia-central/rev/eb159ab3c68c
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #26269 from weideng/bug1100192

Bug 1100192 - [Keyboard][Handwriting] Add words prediction feature. r=timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/2e21a6d14e34
Author: wdeng <wdeng@mozilla.com>
Desc: Bug 1100192 - [Keyboard][Handwriting] Add words prediction feature
Bumping manifests a=b2g-bump