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

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https://hg.mozilla.org/integration/gaia-central/rev/59a671836550
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #15174 from pivanov/bug-947099-followup

follow up patch for Bug 947099 - [Dialer]

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https://hg.mozilla.org/integration/gaia-central/rev/5a194f6dcf52
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: follow up patch for Bug 947099 - [Dialer]