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

========

https://hg.mozilla.org/integration/gaia-central/rev/d870608b416f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1031524 - Search Engine based on MNC/MCC in browser.json is not included in the Settings -> Homescreen -> Search Engine. r=benfrancis"

This reverts commit b6e2864be66af3d88a9f241989e6e60e39c4e4bf.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8965baef85e6c84aa1eb15b2012fab82317e3b49", 
+    "revision": "d870608b416f72e51523dbb0fb79129d2a9a2bff", 
     "repo_path": "/integration/gaia-central"
 }