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

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https://hg.mozilla.org/integration/gaia-central/rev/3607c9c57bb0
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #20686 from bebef1987/sim_contacts

Bug 1025940 - Update self.data_layer.sim_contacts to read SDN Contacts

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https://hg.mozilla.org/integration/gaia-central/rev/2c126db35ac2
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1025940 - Update self.data_layer.sim_contacts to read SDN Contacts

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "bbc80670c2bc1ca6ef312fe0bb30af1c394976c8", 
+    "revision": "3607c9c57bb0e7dedbc64f826b2d5be5a3ce25c2", 
     "repo_path": "/integration/gaia-central"
 }