Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/2ba51c7eadb0
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13624 from teodosia/aurora-contact-photo-wait

Bug 937068 - Unxfail and enhance wait in test_contact_add_photo

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https://hg.mozilla.org/integration/gaia-1_2/rev/d195214d4708
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Bug 937068 - Unxfail and enhance wait in test_contact_add_photo