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

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https://hg.mozilla.org/integration/gaia-central/rev/52650e68be56
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #10955 from masap/20130713

Bug 893299 - Erase CSS error message r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/f9815731edaf
Author: masap <masashi.honma@gmail.com>
Desc: Bug 893299 - Erase CSS error message

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "3841cef10219d5494843b089d6472454ab18d903", 
+    "revision": "52650e68be562232abf3bf66c80538cbd7ae91db", 
     "repo_path": "/integration/gaia-central"
 }