Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/0927ccf3a87e
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 924833 - Re-enable test_receive_call.py" for requiring plivo, which isn't on the mirror

This reverts commit e582fc3be7030e0ce58e385b8951491f64913254.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "eb2336812834e6c5f106273b3ddfd3e8adc2f3c8", 
+    "revision": "0927ccf3a87e38d5a99285cf83762cc8ead7d074", 
     "repo_path": "/integration/gaia-central"
 }