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

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https://hg.mozilla.org/integration/gaia-central/rev/78decf03b39d
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #11550 from arcturus/bug-890490

Bug 890490 - Generic export functionallity

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https://hg.mozilla.org/integration/gaia-central/rev/d805050badf1
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 890490 - Generic export functionallity

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "553800a2a2233ec831db4e70c9456f72068b1071", 
+    "revision": "78decf03b39ded18b914d57f4f3152d6f1b4c56a", 
     "repo_path": "/integration/gaia-central"
 }