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

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https://hg.mozilla.org/integration/gaia-central/rev/ebb5c473c949
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #12487 from crh0716/919884

Bug 919884 - Refresh the displaying connection status based on the real connection status r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/9757e9a8cc95
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 919884 - Refresh the displaying connection status based on the real connection status

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "9fecff8694dc8934c371db83dffa81525b04f2d1", 
+    "revision": "ebb5c473c94911bb98acff5d46f6af209c12583e", 
     "repo_path": "/integration/gaia-central"
 }