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

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https://hg.mozilla.org/integration/gaia-central/rev/49e5310a6ebd
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #13059 from crh0716/903232

Bug 903232 - Show only gsm options by default r=yuren

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https://hg.mozilla.org/integration/gaia-central/rev/49d78decaf7a
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 903232 - Show only gsm options by default