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

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https://hg.mozilla.org/integration/gaia-central/rev/cd489d362898
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #12449 from teodosia/fix-capture-video

Bug 920598 - Fix failing /camera/test_camera_capture_video.py on master

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https://hg.mozilla.org/integration/gaia-central/rev/221338354449
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Bug 920598 - Fix failing /camera/test_camera_capture_video.py on master