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

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https://hg.mozilla.org/integration/gaia-central/rev/1485522e1298
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #14806 from gtorodelvalle/contacts-bug-949470-ben-kelly-patch

Bug 949470 - [Contacts] Broken image links when entering the search mode

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https://hg.mozilla.org/integration/gaia-central/rev/c09076a30327
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 949470 - [Contacts] Broken image links when entering the search mode

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https://hg.mozilla.org/integration/gaia-central/rev/214fe26e8f61
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #14583 from nbp/marionette-with-serial

Bug 948992 - Give deviceSerial number to ADB's device manager.

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https://hg.mozilla.org/integration/gaia-central/rev/434ea62282dc
Author: Nicolas Pierron <nicolas.b.pierron@gmail.com>
Desc: Bug 948992 - Give deviceSerial number to ADB's device manager. r=mdas