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

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https://hg.mozilla.org/integration/gaia-central/rev/4e9ffaa0d192
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Merge pull request #11147 from ferjm/calllogtests

Bug 897118 - TEST-UNEXPECTED-FAIL | 1) [communications-dialer] dialer/ca...

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https://hg.mozilla.org/integration/gaia-central/rev/5bc43217ed8f
Author: Fernando Jiménez <ferjmoreno@gmail.com>
Desc: Bug 897118 - TEST-UNEXPECTED-FAIL | 1) [communications-dialer] dialer/call_log_db Clean up delete_db. r=daleharvey