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

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https://hg.mozilla.org/integration/gaia-central/rev/fb2d2e9fbf5d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19695 from KevinGrandon/bug_1016327_unit_test

Bug 1016327 - [Vertical] Add simple scroll test

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https://hg.mozilla.org/integration/gaia-central/rev/483e60d8b05a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1016327 - Add simple scroll test r=me
Bumping manifests a=b2g-bump