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

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https://hg.mozilla.org/integration/gaia-central/rev/ba76cfc9b8ee
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #10995 from crh0716/886245

Bug 886245 - Ignore calls to openCallScreen when it is already executing r=etienne, a=leo+

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https://hg.mozilla.org/integration/gaia-central/rev/12c412966211
Author: crh0716 <crh0716@gmail.com>
Desc: Bug 886245 - Ignore calls to openCallScreen when it is already executing

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "c2988aaa4cf4d1b6d8c898605038c43f0c926866", 
+    "revision": "ba76cfc9b8eeb119d7000997e354facca32971d6", 
     "repo_path": "/integration/gaia-central"
 }