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/393439e49385
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13660 from AndreiH/bug934480_v1.2

Bug 934480 - [v1.2] Write a test for Messages app matching with contacts

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https://hg.mozilla.org/integration/gaia-1_2/rev/fe62078bd09d
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 934480 - Write a test for Messages app matching with contacts

Bug 934480 - Write a test for Messages app matching with contacts