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

========

https://hg.mozilla.org/integration/gaia-central/rev/f0d9c6d6c2af
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #18079 from comoyo/bug993393

Bug 993393 - Set the correct size for first and last key without doing a sync reflow. r=RudyL

========

https://hg.mozilla.org/integration/gaia-central/rev/112b59b53f3f
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 993393 - Set the correct size for first and last key without doing a sync reflow
Bumping manifests a=b2g-bump