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

========

https://hg.mozilla.org/integration/gaia-1_2/rev/a0a19c97779d
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #13901 from AndreiH/bug933815_v1.2

Bug 933815 Added a smoke test which launches the marketplace app

========

https://hg.mozilla.org/integration/gaia-1_2/rev/52e4331220a2
Author: Karan <karan.basi@mail.utoronto.ca>
Desc: Bug 933815 Added a smoke test which launches the marketplace app