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/fc41923b97bc
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13626 from bebef1987/xfail_email

Bug 937644 - xfail send email tests on 1.2

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https://hg.mozilla.org/integration/gaia-1_2/rev/664d4abb702f
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 937644 - xfail send email tests on 1.2