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

========

https://hg.mozilla.org/integration/gaia-central/rev/5da080cfc243
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #18671 from jrburke/bug796474-email-virtual-scroll-slim

Bug 796474 - [email] quasi-infinite scroll may hitch under OMTC r=asuth

========

https://hg.mozilla.org/integration/gaia-central/rev/1e0c42880d38
Author: jrburke <jrburke@gmail.com>
Desc: Bug 796474 - [email] quasi-infinite scroll may hitch under OMTC; consider using absolute positioning with virtual coordinate space
Bumping manifests a=b2g-bump