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

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https://hg.mozilla.org/integration/gaia-central/rev/e11cf4c78874
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #16081 from viorelaioia/bug_969299

Bug 969299 - Investigate intermittent fail in test_add_photo_to_contact....

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https://hg.mozilla.org/integration/gaia-central/rev/28f382235c1f
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 969299 - Investigate intermittent fail in test_add_photo_to_contact.py
Bumping manifests a=b2g-bump