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

========

https://hg.mozilla.org/integration/gaia-central/rev/25c65e3bdbfb
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #20727 from jrburke/bug1027185-email-certified

Bug 1027185 - [email] switch manifest type back to certified r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/c27d7cf45074
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1027185 - [email] switch manifest type back to certified

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a71c15ee6e62ebc00343265f10b0dee86dfc495d", 
+    "revision": "25c65e3bdbfbd89726f0cc7b9b9ec02a84092fc9", 
     "repo_path": "/integration/gaia-central"
 }