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

========

https://hg.mozilla.org/integration/gaia-central/rev/1e68cf8bff36
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #17116 from pivanov/bug-968483"

This reverts commit 5024a949f5a63dac3abf769264077191d9436010, reversing
changes made to 6f49249b429095064df345c9b24c00f4d7960972.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "1af90729743519c7435e2f91fa7b4cfd3953b037", 
+    "revision": "1e68cf8bff3622535b0460614c51620e76278127", 
     "repo_path": "/integration/gaia-central"
 }