Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/243a34dd7f26
Author: Yuren Ju <yurenju@gmail.com>
Desc: Revert "[Kevin Hu] Fix bug 996549"

This reverts commit 917f925b647b39b1e3a78e2e8b259e28f1af085a.

========

https://hg.mozilla.org/integration/gaia-central/rev/efa52c304238
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18397 from KevinGrandon/bug_996924_home2_bookmarks

Bug 996924 - [Home2] Bookmark datastore sync r=me

========

https://hg.mozilla.org/integration/gaia-central/rev/4fe52c69ff27
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 996924 - [Home2] Bookmark datastore sync r=me

========

https://hg.mozilla.org/integration/gaia-central/rev/7daad549733c
Author: Kevin Hu <kaichih.hu@gmail.com>
Desc: [Kevin Hu] Fix bug 996549

To limit the max length for SSID field to 32 characters.
Bumping manifests a=b2g-bump