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

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a49cf1c4be505e66a5eb72df1c6b190b4f10eab1", 
+    "revision": "bdf8cf7ba350d633f69e8bb37515b878f369bdd4", 
     "repo_path": "/integration/gaia-central"
 }