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

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https://hg.mozilla.org/integration/gaia-central/rev/bdf8cf7ba350
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19441 from guilherme-pg/bug947985-fmd-icon

Bug 947985 - Add icon for Find My Device.

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https://hg.mozilla.org/integration/gaia-central/rev/e7e307f7a12b
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Bug 947985 - Add icon for Find My Device.

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https://hg.mozilla.org/integration/gaia-central/rev/8096b9dc5f62
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19395 from nucliweb/1003060-circle-messages

Bug 1003060 - [VR][Messaging] Empty circle to the right in messages with out recipient r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/bc542e1941a5
Author: Joan Leon <joan.leon@gmail.com>
Desc: Bug 1003060 - [VR][Messaging] Empty circle to the right in messages without recipient
Bumping manifests a=b2g-bump