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

========

https://hg.mozilla.org/integration/gaia-central/rev/2a664cbb4d73
Author: marta <marta@sec.t-labs.tu-berlin.de>
Desc: Bug 1083953 - Privacy Panel r=etienne r=ejchen r=timdream r=gandalf

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "732f412e37ceae8a1d717f6bde5c593a900ac0fe", 
+    "revision": "2a664cbb4d735d9c55fc5b6cf3e39a24bcfbe551", 
     "repo_path": "integration/gaia-central"
 }