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

========

https://hg.mozilla.org/integration/gaia-central/rev/bfd8de1e125d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20597 from crdlc/bug-1025441

Bug 1025441 - [Homescreen] Removed bookmarks show up again when restarting the phone

========

https://hg.mozilla.org/integration/gaia-central/rev/6e4269896e03
Author: crdlc <crdlc@tid.es>
Desc: Bug 1025441 - [Homescreen] Removed bookmarks show up again when restarting the phone
Bumping manifests a=b2g-bump