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

========

https://hg.mozilla.org/integration/gaia-central/rev/790422218779
Author: John Ford <john@johnford.info>
Desc: Revert "Merge pull request #13940 from gasolin/issue-929369"

This reverts commit 616f689484c17b8bd724873c52485dd5a4a29119, reversing
changes made to 6b4dd7baa58fbba70161d7979d8503f8fb9f64df.

Backout because This causes bug 942902

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "49a63b8e54ca0bc6d8b25b8136883edafb5f8f8a", 
+    "revision": "790422218779a3c1d849f878e9640fceee232224", 
     "repo_path": "/integration/gaia-central"
 }