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

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https://hg.mozilla.org/integration/gaia-central/rev/63c90dcb8853
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13743 from viorelaioia/bug_937584

Bug 937584 - Modify test_sms_to_dialer.py to use SendSMS atom

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https://hg.mozilla.org/integration/gaia-central/rev/b79d7f1bc534
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 937584 - Modify test_sms_to_dialer.py to use SendSMS atom