Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/31dadd978219
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #27210 from KevinGrandon/bug_1118891_remove_geolocation_request

Bug 1118891 - [E.me] Remove geolocation request from api helper

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https://hg.mozilla.org/integration/gaia-central/rev/ba17799efa0b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1118891 - [E.me] Remove geolocation request from api helper r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/9880d46209dd
Author: Greg Weng <snowmantw@gmail.com>
Desc: Revert "Merge pull request #27052 from snowmantw/bug1116091-rev2"

This reverts commit 12d74b902d356f94837bcf0edcd4f4089f77207d, reversing
changes made to 91bd809dc8c3f0f600b782f09443be4d954e9ff9.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "85bbbd703dba85b58c5b9d5902bc784c9f763c1d", 
+    "revision": "31dadd9782191eff4f5cc01e6169279727ed76d6", 
     "repo_path": "integration/gaia-central"
 }