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

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https://hg.mozilla.org/integration/gaia-central/rev/cbe920b4ab50
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #10935 from crh0716/889733

Bug 889733 - Disgard the proximity event if the SCO is connected r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/189764704269
Author: crh0716 <crh0716@gmail.com>
Desc: Bug 889733 - Disgard the proximity event if the SCO is connected

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "ba76cfc9b8eeb119d7000997e354facca32971d6", 
+    "revision": "cbe920b4ab50fd517e334b415629b7a774af0260", 
     "repo_path": "/integration/gaia-central"
 }