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

========

https://hg.mozilla.org/integration/gaia-central/rev/7a8f719c4824
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1052136 - follow up fix to a unit test that regressed. r=me

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "dace5f5cc26e0f5b2500afa991ce75fad5610a6c", 
+    "revision": "7a8f719c4824fae2e5933c1ec42a34641d1a92d7", 
     "repo_path": "/integration/gaia-central"
 }