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

========

https://hg.mozilla.org/integration/gaia-central/rev/3c6aad9bbd93
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #25640 from huchengtw-moz/bug-1090806-remove-files

Bug 1090806 - [Stingray] remove useless file from smart-system, r=rexboy

========

https://hg.mozilla.org/integration/gaia-central/rev/c61dc4d0ca8b
Author: John Hu <johu@mozilla.com>
Desc: Bug 1090806 - [Stingray] remove useless file from smart-system

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "1a6d1000f29f30e55dedd07a43cce643694e5c52", 
+    "revision": "3c6aad9bbd930106af4df64eb9a4af56b9ac7e9d", 
     "repo_path": "/integration/gaia-central"
 }