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/22888ee4b51b
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13620 from bebef1987/enable_three_apps

Bug 937629 - Reenable test_cards_view_kill_app_with_three_apps.py

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https://hg.mozilla.org/integration/gaia-1_2/rev/c805ee6b3437
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 937629 - Reenable test_cards_view_kill_app_with_three_apps.py