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

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https://hg.mozilla.org/integration/gaia-central/rev/57244a3919b7
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #10821 from mcirlanaru/bug_883131

Bug 883131 - [Call-Log] Show different empty call log messages for... r=@gtorodelvalle

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https://hg.mozilla.org/integration/gaia-central/rev/85c82bcaded6
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 883131 - [Call-Log] Show different empty call log messages for the 'All' and 'Missed' tabs. r=gtorodelvalle