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/99644710f0fc
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Merge pull request #13899 from AndreiH/bug941563

Bug 941563 - [v1.2] Re-enable test_cards_view_kill_app_with_three_apps.p...

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https://hg.mozilla.org/integration/gaia-1_2/rev/ba020c5011c3
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 941563 - [v1.2] Re-enable test_cards_view_kill_app_with_three_apps.py