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

========

https://hg.mozilla.org/integration/gaia-central/rev/200ccf79991c
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Revert "Merge pull request #13230 from fbukevin/issue929377"

This reverts commit cca35de2ff8993be019b3da889bac406915cc212, reversing
changes made to 31687ef383bc1b85a9d388fb3dde610ab7e8f8fd.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "8ff42fad2e152e5703d3268e1c5454bcdc7fb961", 
+    "revision": "200ccf79991c88283d36c1eff17e67d926598834", 
     "repo_path": "/integration/gaia-central"
 }