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/055ea4290aa4
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Merge pull request #13621 from AndreiH/bug937079_v1.2

Bug 937079 - test_gallery_view.py is not switching to landscape view

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https://hg.mozilla.org/integration/gaia-1_2/rev/ec822a52ab1f
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 937079 - test_gallery_view.py is not switching to landscape view