Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c0fe4b194d81
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12435 from zacc/bug917523

Bug 917523 - repair and reenable test_keyboard_change_language

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https://hg.mozilla.org/integration/gaia-central/rev/4468ba29e924
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: bug 917523 - repair and reenable test_keyboard_change_language r=alint/bebe

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https://hg.mozilla.org/integration/gaia-central/rev/fe03c7d89523
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #12399 from etiennesegonzac/bug-919446-call-group-details-glitch

Bug 919446 - Fixing a glitch on the call group details screen. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/252d57f0411d
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 919446 - Fixing a glitch on the call group details screen.
r=Rik
Bug 917435 - Support sizes in mozbrowsericonchange event. r=fabrice
Bug 908098 - Randomize UDP listening port. r=nsm