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

========

https://hg.mozilla.org/integration/gaia-central/rev/c89138fb9550
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Merge pull request #20033 from eeejay/bug-1020605"

This reverts commit 763b7f62805570b1606b8738075318020af3fa7d, reversing
changes made to e794eeb8dcb308cd7b1580717ef38e2880987634.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "9aae77d344a61c19a6b82790ea53c69534427b6b", 
+    "revision": "c89138fb95502318d7f087ff07551f57158cf386", 
     "repo_path": "/integration/gaia-central"
 }