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/ac77440c6dde
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13805 from AlinT/unxfail_edit_photo_test

Bug 939839 - Unxfail test_gallery_edit_photo

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https://hg.mozilla.org/integration/gaia-1_2/rev/678d11ca093c
Author: AlinT <trifandreialin@gmail.com>
Desc: Bug 939839 - Unxfail test_gallery_edit_photo