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/9d286e181309
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14069 from viorelaioia/bug_930052_v1.2

[v1.2] Bug 930052 - Reduce exposure to launch() method inside tests.

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https://hg.mozilla.org/integration/gaia-1_2/rev/c499b9bca245
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: [v1.2] Bug 930052 - Reduce exposure to launch() method inside tests.