Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/b150bbd90af2
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #13299 from mikehenrty/master

Revert "Bug 930104 - Remove localId=0 hack for the system app on firefox...

========

https://hg.mozilla.org/integration/gaia-central/rev/b172d50cca39
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Bug 930104 - Remove localId=0 hack for the system app on firefox and correctly set permission for any app loaded in Firefox r=vingtetun"

This reverts commit 73840d5463c15cf7bb535eda813b666b933fa11a.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b8d6e9efac73162573d0dcad50773ffab32d56ac", 
+    "revision": "b150bbd90af28c38d8f695b5d51047e068c38521", 
     "repo_path": "/integration/gaia-central"
 }