Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-2_0/rev/de2cb00659b8
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1025632 - [EverythingMe] Context: Connection type, MCC, MNC

========

https://hg.mozilla.org/integration/gaia-2_0/rev/99b6158c4895
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1022414 - [Vertical] Dragdrop improvements r=crdlc

Many improvements to drag drop in vertical homescreen including:
* Ignores dividers during distance calculation and relys only on icons or placeholders to determine proper drop target.
* Render a row of placeholders after the last divider. This ensures we have a valid drop target even if we ignore dividers.
* The last row of placeholders have a smaller size are are only for divider creation.
* Buffers from/to indexes to have slightly better performance and prevent the stuck icon situation.

========

https://hg.mozilla.org/integration/gaia-2_0/rev/ea4dbd2937d3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1024863 - Safeguard against potential race condition r=lightsofapollo
Bumping manifests a=b2g-bump